Taking Sports Performance to the Next Level
Posts tagged foot function
Foot Function – A Case Study
Jun 17th
This is a small case study of one of the members (nba8340) of our forum. He contacted me with the following post:
“hey alex, i know i asked you this awhile about what shoes to get. I’ve always worn bball sneakers, and i tried on the nike zoom waffles like you said to check out but they just felt real bad, i have very flat feet and my feet instantly were collapsing in and i knew that if i even tried to run or do anything in them i would sprain my ankle or something. So just wondering what you would recommend to get or if you had any other thoughts, i just want a light pair of sneakers not bulky like bball shoes that i can use for everyday wear, lifting, or some sprinting. Maybe cross trainers would be the type to look at, however i tried on a few stability running shoes at the store and actually bought the brooks shoe
http://www.brooksrunning.com/p…..GTS%2010
i’m starting to think now after talking to adarqui, it doesn’t make any sense to have those sneakers since i’m not interested in doing any long distance running however they do feel better than wearing the bball shoes i always wear as my feet don’t collapse as much in them. Are their cross trainers or something i could buy that are geared more towards ppl with flat feet but that i could also be good using for everyday, lifting, sprinting, etc?”
Now I had recommended minimalist shoes without ever seeing his feet (mistake). After this post I asked if he could video himself walking, as well as video different images of his feet so we could get a better feel for what we were dealing with. Luckily he obliged with the video below:
I then forwarded his questions and the video to my friend Dr. Shawn Allen who has far more experiece dealing with foot function than I do. Below is his response:
“1- flat feet…….of course.
2- impaired ankle rocker (mortise dorsiflexion) hidden by the fact that there is APPARENT ankle rocker but it is actually rocker obtained through excessive rear and mid foot pronation. Suspicion……weak anterior compartment (see my youtube:
3. there is a rotational spin in his gait as evidenced by his “pinch” callus at the medial great toe…….this is evidence of foot spin into external rotation…..which is usually a sign of impaired ankle rocker or lack of internal hip rotation……or both……certainly many other things can cause this but without examination of client it is up for guessing
4. recommendation is always to build intrinsic foot strength (lumbricals, FDB etc) as well as anterior extrinsic strength (Tib Ant ie) in a logical pattern for this client…..each client is different.
5. orthotic is a bandaid…..but might be helpful here………but doesn’t fix anything
6. increased foot awareness to avoid collapse is imperative……..he needs to de-train this aberrant neurological recruitment pattern of the foot intrinsics-extrinsics and relearn foot tripod and progress from there
7. shoe……well, more support improves (reduces) the collapse……as foot becomes more skilled……and stronger…….reduce extrinsic shoe assistance……
8. brooks adrenaline…….saucony hurricane or Omni……asics (evolution)…….saucony MC stabil are good shoe choices……..
9…..******* if he has a forefoot (FF) varus a posting on the shoe insert will help him find a reasonable tripod……..if the FF varus is fixed…….the post is critical…….if the FF varus is functional (due to weakness and unawareness of how to achieve the tripod position) then he must relearn tripod and work upward to more SSE (skill, strength and endurance……..the mantra of The Gait Guys)
“
For drills that improve foot function please check out the following series of articles:
Foot Function for Sports Performance Part 1
Foot Function for Sports Performance Part 2
Foot Function for Sports Performance Part 3
I would like to thank Dr. Allen for his help in this mini case study and nba8340 for allowing me to post this on the main page, as I have learned a lot and I hope nba and the rest of my readers have picked up a thing or two.
Dr. Allen is in the process of launching a new site called The Gait Guys. It is in its infancy and will be completely updated during the next few weeks.
Enjoy
-Alex
Foot Function for Sports Performance Part 3- Forefoot Dominance
Mar 29th
Foot Function for Sports Performance – Becoming Forefoot Dominant
By now you should have a fairly nice and strong foot. Our next goal is to develop ankle stiffness and forefoot dominance.
First lets talk about forefoot dominance. Every coach in the world yells at their kids to get on their toes. This is true from MMA to football to sprints. Being on your toes allows for more acceleration, quickness, and speed. How do you get to your forefoot. Simple. Your “toes” or forefoot is made up of a bipod. What is your foot bipod. This should be simple to find. From the earlier articles you should have already found your tripod comprised of the base of your little toe, big toe, and heel. Your bipod then is the tripod without the heel contact.
What is ankle stiffness? More >
8-7-6-5 results
Mar 24th
Ok guys, I have “finished” my 8-7-6-5 cycle BUT I haven’t even reached my stagnation step. I had to stop it because of injury (my right leg is all injured, with pain in the Achilles’ tendon, ankle, knee and hip). It’s not because of squatting but because of some awkward jumps I did a few weeks back when it all started.
Anyway, even in this situation, I managed to improve my all time squat 8RM by 5 kg. Meaning, the best I could ever squat for 8 reps was 110 kg (242 lbs) and I managed to squat 115 kg (253 lbs) for 8-7-6-5 a week ago when I decided to stop the cycle because of the injuries. I have no idea if I would’ve been able to increase even further, as I haven’t reached my stagnation in this cycle, but decided to stop because the knee was bothering me and I was training for way too long for strength and neglecting the fat levels and reactive ability.
Now that it’s warm outside, just perfect for track training, I decided to switch strength to maintenance and work on lowering my body fat levels (which are at about 16-17% by the way) and when I’m done with them (I want to lose about 6-7 kg of fat if possible) I will train for reactive ability and jumping skill more.
Anyway, the point was that the 8-7-6-5 works and works good, at least for me. And it always seems like nothing ever works for me so that should tell how efficient this has been. It is very demanding though, and you need good nutrition and good recovery, also being offseason so you can only focus on strength, for it to work.
Good luck!
Prime time runs
Mar 11th
Just been playing with prime time runs, and found a better way to perform. We have been reaching out with the lead leg more, almost like stepping over a low hurdle. The idea is to get the foot to strike in front of the center of mass. In a neutral position. Also, keep the ribs anchored down. try it and you will see a lot more ham and ab involvement.
Foot Function and Sports Performance Part 2 – Ankle Rocker
Mar 9th
Improving Foot Function for Sports Performance Part 2
In the last article we talked about finding your foot tripod. In addition we also laid out a foot strengthening progression aimed at improving your foot tripod and strengthening your arch. This article we will discuss the significance of ankle rocker for sports perfomance and outline a progression aimed at improving ankle rocker (aka ankle mobility) for sports performance.
What is Ankle Rocker?
When we walk we utilize three different foot rockers: heel, ankle, and fore foot. When you walk fist you heel strike. At this point your body rocks over the heel as the foot comes flat on the ground. Next you rock over your ankle joint ad your tib-fib progress past 90 degrees of dorsiflexion (ankle rocker). Finally when you reach the end of your ankle rocker you pick up your heel and rocker over the fore foot and toes.
Why is Ankle Rocker Important?
We all know (or now know) that locomotion is driven by hip extension and your primary hip extensor should be your glutes. If your athlete has insufficient ankle rocker, when walking they will get to 90 degrees (of plantarflexion/dorsiflexion), pick their heel up and use their claves to push themselves through the gait cycle. The person with a gait pattern like this is often referred to as “quad dominant” although the term “push runner/walker” may be more accurate. So rather than extending through the hip and utilizing the most powerful muscle in the body (glutes) they extend through the quad and calf. It is worth noting that this is merely one compensation pattern for getting around a poor ankle rocker and for more information on other ankle rocker strategies please check out the video below.
You should also know that when you lose ankle rocker one of the strategies it to collapse through the arch. This can lead to a number of pathologies including plantar fasciitis, turf toe, bunions, and achilles tendonitis.
When it comes to sprinting, which we all may be more interested in, poor ankle rocker causes other issues. It interferes with the body’s ability to maintain a forward acceleration lean which we all know leads to a lower top speed. In addition, it also interferes with glute function leading to the athlete wanting to push themselves down the field or court using the quads and calves as opposed to pulling themselves down with their glutes (push runner vs pull runner). Try this place your hands on your butt and walk. Note the glute activity. Now pull your toes to your face and walk. Did you notice more glute activity? Of course you did. They muscles used to create ankle rocker are are linked to the glutes through the same neural pool.
For an excellent look at a push runner versus a pull runner check out the videos below. They are the same athlete! The firs video is of the athlete after working with colleague Chris Korfist at the end of the summer. At this point he is a pull runner. You can really see this with the amount of hip extension the athlete achieves at toe off. A nice straight line.
The next video is of the same athlete after spending a year in his collegiate strength and conditioning program. Notice the angle at the hip during toe off. This is a classic push runner.
This next video is a bit long. This is a video analysis of a sprinter done by Dr. Ivo Waerlop. This sprinter has some ankle rocker issues as well as some others. In it Dr. Ivo points out the issues and describes the implications for performance.
Hopefully by now you can see that ankle rocker deficits can open the door for injury as well as limit speed and on field performance. Now you may be wondering how do we improve ankle rocker?
Ankle rocker has more traditionally been trained using Michael Boyle’s ankle mobility drills seen here
The ankle mobility exercises were an excellent starting point but they have one problem. They only address the posterior compartment. So if tight calves are your problem the drills will loosen your calves but it begs the following question:
Are the calves just chronically tight or are they tight because they are to strength imbalance between the anterior and posterior compartments?
If your calves are chronically tight then the mobility drills above will do an excellent job, however if the tightness is neurological protection due to a lack of anterior compartment strength then stretching is not addressing the root cause of the loss of ankle rocker.
Based on my experience, most of the time the tightness is a symptom of poor anterior compartment strength. So the tightness is because you do not have enough anterior compartment strength to pull yourself through the ankle rocker.
Ankle Rocker Strengthening Progression
Squat with Toes Up on Tripod (see previous article for finding your tripod)
Squat with Foot in Arch Support Position (See Previous Article for arch support exercise)
King Deadlift with the Toes Up
King Deadlift with Arch Support Position
Shuffle Gait
Reverse Shuffle Gait
Both shuffle gait drills can be seen in the videos below:
***Note – Please pay attention to the foot positions next to each exercise. For descriptions on the foot positions please see the previous article***
Improving Foot Function for Sports Performance
Mar 2nd
Improving Foot Function for Sports Performance
I want to start my saying that I am not a foot expert I am a sports performance coach. Much of the information presented in this article has been gleaned from Dr. Shawn Allen, Dr. Ivo Waerlop, speed coach Chris Korfist, and our own experimentation with our athletes. Needless to say we have seen tremendous improvements in sport performance when addressing foot deficiencies.
Why is the foot important?
This is a very simple question with a fairly simple answer. Your foot is where your body interacts with the ground. It is the start of your kinematic chain. A poorly functioning foot will limit your hip extension power production, can cause excessive anterior pelvic tilt leading to back pain, cause medial and lateral anterior knee pain, shoulder problems, neck issues, and a whole host of maladies. You may be thinking “how does a bad foot cause neck problems?” Simple. If your foot doesn’t function properly it throws off your knee alignment, which works its way up into bad hip/pelvis alignment, causing bad lumbar alignment and slowly works its way up to your neck. So you may visit your Dr. who will treat your neck and prescribe PT. The PT may be familiar with Grey Cook and Mike Boyle’s joint by joint approach and address the joints above and below the pain which will help a bit but, I guarantee you, neither the PT or the Dr. will look at your foot as a potential cause of your neck pain. In essence, they will be treating symptoms and not the root cause. Enough with the injury talk. This is a sports performance article so lets talk sports performance. Your foot IS where the rubber meets the road!
The Foot Tripod and Sports Performance
Your foot is designed to function like a tripod. The three points in contact with the ground are the heel, the big knuckle at the base of the big toe and the same joint at the base of the little toe. When the three points are bearing load your foot is in it’s most stable position. If one of the points in the tripod is not bearing load your CNS will sense that instability and turn off/inhibit some of the muscles responsible for whichever action you are trying to produce. If you are walking you will see reduced glute activation. So step 1 in improving foot function for sports performance is finding your foot tripod.
You may be thinking “Alex we sprint on our toes so why are we wasting time talking about our heels” and you would be correct BUT when people have trouble finding their tripod the heel is rarely the issue. Most people have trouble loading either point on the forefoot (big knuckle of the big and little toe). So we must begin at the beginning and first establish a solid tripod before we can work into a solid forefoot bipod for sprinting. As an aside, begin at the beginning is one of my favorite sayings. Too many athletes try to start in the middle or at the end. As another aside, it has been our experience that the movements used to establish a solid foot tripod do an excellent job strengthening and rebuilding the arch so these exercises serve a dual purpose. This is because the toe extensors also serve to support the arch.
How do we go about finding and strengthening our tripod? I like the following progression:
*Note for all exercises hold the contraction for 20-30 seconds and do 10 reps 3x/day
1. Isometric non loaded seated toe extension holds – while seated dorsiflex your toes pulling them towards your face. While you are holding play around with foot position until you are able to get all three of the tripod contact points in touch with the ground. Keep your foot pointed straight ahead.
2. Isometric non loaded seated toe extension- This is just like the previous exercise but now shift some of your body weight onto the foot.
3. Isometric non loaded seated arch supports- Begin this movement with your toes extended. Slowly let your toes come to the ground while maintaining arch elevation. Do not let your arch collapse when the toes come to the ground.
4. Isometric loaded seated arch supports- Again this is just like the last movement but now you are going to be shifting some of your body weight onto your foot and still not letting your arch collapse to the ground.
The next 4 are just like their seated counterparts only you do them standing. For non loaded versions or to partially load a movement where you are not strong enough to fully load the foot use 1 leg as a support leg and slowly load the non support foot.
1. Isometric non loaded standing toe extension holds.
2. Isometric non loaded standing toe extension.
3. Isometric non loaded standing arch supports.
4. Isometric loaded standing arch supports.
I realize that some of the more advanced foot people may be thinking “What about short extensor strength?” I do acknowledge that short extensor strength is important but it is my opinion that in a large group setting coaching short extensor strength will be near impossible. For those interested you could include the following 2 short extensor strength drills in between steps 2 and 3 in both series.
1. Isometric non loaded seated/standing short toe extensor holds.
2. Isometric non loaded seated/standing short toe extensor holds.
To activate the short toe extensors pull your toes towards your face. Next relax your toes so that the first knuckle from the tip of the toe relaxes but you stay dorsiflexed at the big knuckles at the base of the toes. Your foot should look sort of like a claw. If you choose to add these in to the progression each progression becomes 6 steps long with the short extensor holds becoming steps 3 and 4.
Finding your foot tripod is step 1 in developing a functional foot. Our next article on foot function and sports performance will look at the all important ankle rocker function.
Enjoy!
Alex
Shoulder Mobility and Health
Feb 19th
These active stretches are the brainchild of my friend Colin. They are excellent!
1) tuck chin hard and pull shoulder blades back together, really stretch the pec minor and hold for 20secs
2) tuck chin, pull shoulders down and internally rotates arms as hard as you can and hold for 20secs. Arms will be locked straight
3) the same but externally rotate them, with arms coming out to the side away from the body. It will naturally go there anyway and pulls arms towards the rear a bit, locked straight
4) reach overhead and rotate arms like your gonna do a shoulder width chin up and then pull the arms towards the rear using your upper back muscles, and feel the lats stretch etc. Hold for 20 secs
5) hold your hands behind you back, pull shoulders down and back, and pull your head to one side, looking slightly upward to stretch the neck muscles, hold for 20secs, repeat on the other
Enjoy!
Chris Korfist Interview
Feb 18th
For those who don’t know you, if you could give us a brief background about who you are that would be excellent?
I am a speed trainer. I work mostly with people who want to improve their speed ranging from middle school kids to Olympic athletes. I have been involved with Inno-sport which, when died, changed to wannagetfast.com with Dan Fichter.
In a few sentences could you outline your training philosophy?
My philosophy is to try to get an athlete to move as effectively and as efficiently as possible. From that point we try to add a power or speed component. It is a very individualized process and it requires some time and assessment of the athlete to determine their functional deficits so see where their limitations and “power leaks” exist.
You were one of the first inno-sport supporters, do you still use the inno-sport principles and system?
I think the aspect that gets lost over the inno-sport system is that it is what was written in the book. I think what happened was that Dan and I paid someone ( I say someone because I don’t actually know who I was corresponding with but it was someone who knew what they were writing about) to help individualize programs for our athletes. The book came out at the same time which was an attempt to put all of the ideas together. And then you have the people who don’t want to put the time into the book and say it is too hard or it doesn’t work. Novels are meant to be read. Texts are to be studied. I think the book has a lot of good basic training principles that I still use. However, in the last 7 years I have learned how to use the exercises more effectively and when to use them on a case-by-case athlete basis. Everything seems to have some value, but it is how you dissect the information and know where and when to utilize them that gives them value for your athlete in their training. For example, different foot positions for different exercises, using muscle chains etc. I also have new stuff that I try to sometimes add to my “tool kit”. Some people are not patient and will only use an exercise a couple of times so you can’t really see if anything is working. I really use very few exercises but I use them well. Jay Schroeder has a few. Pilates has a few on different apparatus’. Louis Simmons uses a few. Too many people just aren’t patient.
Some People have criticized the inno-sport system, Wannagetfast, and Slow Guy Speed School as being overly complex how do you respond?
Sorry. My clients, people who pay me, don’t seem to mind.
How has your approach to training changed since inno-sport closed down?
The closing of Inno-sport has had little effect on my attitude toward learning. I have always tried to learn as much as I can and my education with inno-sport was part of my journey. I continue to learn new things all of the time and try to effectively apply them to people I work with. For example, we use line hops as an exercise. But learning the right way of doing them (with attention to proper gluteus medius control at the hip, and proper foot contact as examples here) as well as when to use them is more important for individuals to progress. I think that is why I have a hard time writing articles. The more I learn, the more I realize I do not know and the further away from “universal rules” or “exercises for everyone” I go. For example, just the foot on its own is an incredibly complex body part and its misuse can drastically change a simple exercise. Movements in the hips and abdominals are so complex with timing that some basic staple exercises really make little sense if the athlete is concerned about movement.
Mike Boyle has recently replaced you as the poster child for the anti-squat campaign. Why are you so anti squat?
I am “anti-squat” if you are using it for speed and power development. I think that coaches get so caught up in the exercise and their power clubs that they actually hurt their athletes more than help them. My guide to depth is that depth of a squat can only be determined by the ability of the athlete to activate their entire abdominal wall (TVA, obliques and rectus). When you break/extend at the waist to get deeper, because you lack the abdominal/hamstring strength/coordination, it becomes a back extensor/quad movement. When your shoulders cannot support extreme weights, posture goes out the window and the carry over to athletic movement lessens. Frans Bosch talks about the depth in the squat creates muscle slack which has little carryover to sprinting or jumping. I think the basic idea is that athletes that move quickly should not be trained like a power lifting athlete. But we like to take something we understand and is easy and apply it to everything. Distance runners use a swimmers template to log miles but swimmers don’t pound on the ground. A squat does not take into account the stability and strength that is needed to support the body on a single leg. It doesn’t take into account the coordination between the core and hips. Nor does ever approach the concept of contact time on the ground. So, for me, it is a exercise that is pretty far down the list when it comes time to develop someone that needs to sprint. Remember, organizations have principles that they push forward. It is difficult to undo their doctrine. And they will fight to protect their doctrine because if they are wrong, it will undermine their credibility. Welcome to the NSCA.
What process do you go through when designing team specific workouts as opposed to individual specific ones? Since every athlete has different needs, how do you go about deciding what factors to focus on?
I don’t do group programs anymore. I only do them with my track team, not for other people. There are so many people opposed to what I do that they will undermine the program and say that it doesn’t work. Every team that I have worked with has faced this problem. Coaches believe that they did it a certain way and that is the way it will be. I worked with a track team and they broke every school record and placed higher in the state meet than any other time in the history of the school and the program didn’t work because they can’t squat as much. I have an athlete that in the first meet set a school and field house record in the Long jump and 55. He improved his long jump 20 inches and knocked .4 of his 55. His one coach told him that if he started squatting he would be even faster and jump farther. The other one told me all that he did for the athlete in the previous two weeks to get him there. With my group in track, each guy gets a separate workout for what they need. I had one kid sprint once a week and spent the rest of his time on a total gym. He was all-state in 4 events and was 2nd at Outdoor nationals in the 4×200.
You have struck up a relationship with some very smart folks Dr.’s Shawn Allen and Ivo Waerlop. What have they changed in your approach to working with athletes?
I have learned that I know even less than I thought I knew. Every person is a puzzle to be figured out. I have a hard time writing articles because I know that for the one person that inspired me to write something, I will hurt 20. The Gait Cycle is incredibly complex. The human body is incredibly complex. We know so little. Just a hamstring pull could be a 3 part mini-series on CSI.
You guys talk a lot about getting to your big toe, why is this important for sports performance?
The foot is designed to roll the energy to the big toe. That is why we have smaller toes and one big one. When the extension of the hip occurs, the push should go right through the big toe. If you come off the outside of the foot, you will never get to effective hip extension and thus limit glute power. The big toe also grabs the ground as do the other toes. It even has an eccentric joint unlike most other joints of the body in which the axis of motion is rather fixed. What I find interesting is the role of the pinky toe (5th toe). If it doesn’t grab (and when i say grab i do not mean claw into the ground like a hook, i suppose i mean engage the ground with force), it can create a spin in the forefoot, which, in turns, creates a power leak and longer ground contact which puts tremendous pressure on the lateral stability of the body. In some cases where this is a major power leak from your evaluation, if you fix your clients little toe, you know, the one that is all curled up into a ball and doesn’t even have a nail, the client can run faster because the purchase of the forefoot on the ground is solid and action/reaction forces are in sync (Newtons 3rd law).
Is there a neurological link between the big toe and the glutes?
More of a mechanical pattern. Smash your client’s big toe and see how a person’s gait changes. I am sure there is some neuro connection as well. This is where I use Dr. Waerlop’s knowledge.
What kinds of improvements have you seen by fixing foot function?
We have improved sprint times and contact times on the mat. But more important it allows the body to move the way it is designed to move. A lot of what your body does is a response to what happens when your foot slams on the ground in a gait cycle. If you have an injured big toe, your body is going to respond by not allowing pressure on the that toe, much like if you have a hang nail and can’t grip something because of the pain. From there, the next big and logical sequenced question is whether the body can maneuver around the ankle. This is where ankle rocker (aka: dorsiflexion) comes into play. How does 98% of your body weight get over the stick in the ground (leg).
Similarly there is a lot of discussion about getting a solid foot tripod, why is this important?
Neurologically, your body knows if the platform is stable or not. And if it is not stable, it will govern the power allowed to the limb. An extreme example would be to put a tack on the ball of your foot and see how your body responds. This is where the squat thing comes into play. When most people are trained to squat, they roll onto the outsides of their feet. When that movement becomes the strong pattern that is what an athlete will use as the dominant recruitment pattern.
What are some simple drills or exercises one can do to help them achieve a stable tripod and get to their big toe?
In part, the short and long extensors of the toes help keep a stable front tripod so we do single leg squats focusing on foot tripod. In the new DVD, Dr. Allen spends over an hour describing how it works and how to develop the tripod and ankle rocker.
It is my understanding that the foot, neurologically, is almost as complex as the hand so obviously diagnosing and retraining proper foot function cannot be done in a few short sentences or paragraphs. I know you have been diligently at work with the good Dr.’s filming a new DVD series discussing foot function. The first of DVD was released recently. What does the first DVD cover?
In his presentation to the NSCA, Dr. Allen discusses the lower limb and its impact on the rest of the body and how to regain this lost function.
What can we expect from the upcoming DVD’s?
Right now we are in a hold pattern. We aren’t sure what direction we will go but there are some amazing concepts on the table, we are just trying to figure out the next logical progression so everyone can follow our process. So many people are against change and learning new concepts that it doesn’t seem to be worth our time to make new stuff. But we remain hopeful.
What does your current training process look like?
I video the athlete running and jumping to give me clues to weaknesses and equally important, their compensation patterns for these weaknesses. I also have a series of tests to see how things work. When I have built an efficient machine, I start to add strength or power with isometrics. I have been spending more time on lateral stability. I have found that if you lack the lateral strength, the brain will restrict the power to go out back. Again, standing on two legs to do your work, the lateral single leg stability gets minimal work.
What drives you nuts about the industry?
Inability to accept change. But I really don’t deal with “industry”. I have a little gym that I don’t pay rent with lots of clients. So, I only deal with the industry as much as I want.
Thanks for your time and if any of our readers are interested they can pick up the excellent DVD’s at Wannagetfast
Thank you
Depth Jump Performance
Jan 29th
Recently the following dilemma has been posed on another site that I frequent:
How come we preach to perform depth jumps for maximal height as opposed to the more common way of minimizing ground contact time (GCT)?
Here was my reply:
Shorter ground contacts are better at improving “reactive ability”. If you read Verkhoshansky’s work you will discover that he recommends DJ off a small box to improve RA. The smaller box correlates with shorter GCT. The aim though is still a maximal vert cause the goal is alwsys to improve maximal ability. Verk recommends DJ off of high boxes for explosive strength.
So there you have it. I like this way because it simplifies things.
1. how do you measure your GCT
2. since minimizing GCT requires submaximal effort how would you regulate volumes (areg) as you wont be able to know when performance decreases because measuring subsequent jump height will be inaccurate because you could compensate and keep height the same by increasing GCT and most people here cannot measure GCT. Of course we can assign arbitrary volumes but we know that is not optimal.
3. How do you know when your minimal GCT has turned into maximal force? .1 sec of a drop off is almost imperceptible. .05 is imperceptible. At this point you have lost the purpose of the movement.
4. How do you know if you have progressed? Can you tell if your GCT has decreased by 0.03 seconds?
So if you go off a lower box and still focus on maximal height you will train RA and be able to monitor performance more accurately
Also remember that DJ’s are a power exercise and as such power is a threshold best trained maximally. If you want RA at submaximal levels then perform low squat foot jumps and such.
So in summary do DJ of a low box for height if you want to develop RA. It trains the same thing and offers the same benefit as attempting to minimize GCT but with the added benefit of being easier to monitor progress and performance.
Perform DJ’s of a high box to increase explosive strength. They are two distinct exercises with different aims.
-Alex