[quote]Roger Nelsen wrote:
seph89 wrote:
I keep hearing talks of leg strength, explosive power, squat correlation and so on but not much talk of flexibility. The thing is lots of people underestimate how much flexibility can contribute to agility and leap. You want proof. Look at Kadour Ziani. He is actually 5’ 11" but his secret is that he stretches 4 hours a day as he claimed in an interview. He gets his vertical leap from “elastic energy”. But I’m not saying that strength and squatting doesn’t come into play when it comes to jumping high. It’s all these things that an elite athlete must utilize to rise to the peak and beyond. I am designing a program for just that. Check out my topic “Elite Athlete Workout” and feel free to help me all you can with advice/suggestions on how to make the most efficient workout.
p.s. you want to increase your vertical leap? look into Jumpsoles. ; )
I’m sorry, but the ignorance expressed in this post was too much for me to pass by. Just about everything you said was terribly, horribly, wrong. Not anything against you, but you are severely misinformed.
First of all, flexibility has nothing to do with “elastic energy.” Elastic energy is what is generated during high speed movements in which the tendons provide the majority of the power. What happens is that the muscles lock up and even shorten, stretching the tendons like rubber bands. When the tendons snap back to their original length, like springs, the energy is transmitted back to the ground, load, or whatever. Activities like top speed sprinting, or throwing a fastball are almost entirely dependent upon so called “elastic energy.” Again, flexibility has nothing to do with this.
The fact that KZ jumps so high has nothing to do with his training methods, but everything to do with what he was born with. He has a thin skeletal frame, high muscle insertion points, long tendons, a high natural fast twitch ratio, is carrying very little excess weight around, and does nothing but jump. His body is basically the perfect spring. One more time, flexibility does not play a part here. In fact, static flexibility training actually decreases tendon stiffness, and therefore is actually inhibiting his body from generating as much force as possible.
Second, forget about Jumpsoles. They’re nothing but a cheap gimmick designed to strip gullible teens of their money. By nature, Jumpsoles increase GCT, add weight to the very distal point of the limb (thereby messing up motor patterns), and compromise the safety of the achilles tendon. Really, I can’t think of a positive for these things, unless you get the proprioceptor plugs and use them as part of your warmup. Hardly work the money though.
Now, not addressing the person above, the standard vertical leap (or countermovement jump) utilizes the quads more heavily than any other kind of leap and is based off of explosive power more so than stiffness and reactivity. The muscle contribution is hard to ascertain, but I would venture to say that vertical propulsion comes from the following muscle groups in these rough proportions:
Quads - 30-40%
Glutes - 30-40%
Hamstrings - 10-15%
Gastrocs - 10-15%
Shoulders/Arms - 5-10%
Of course, other muscle groups such as the erector spinae need to be strong isometrically to support the upper body, but they are not propulsive muscles. Unlike many claim, the hamstrings are in poor position to generate force during a CMJ and therefore don’t contribute much. The gastrocs are in a similarly awkward position so their power is limited too. This leaves the prime movers as the quads and glutes. The proportion of each will change based upon which muscle group is the most developed.
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Firstly Roger Nelson, I did not claim these things which you so utterly describe as “terribly, horribly wrong”. I should have put them in quotes because if you looked at the link which I put then you would have seen that all of those things actually came from the interview. Perhaps I should have put it into quotes. I have a question for you. Are you a doctor or a very experienced strength coach? Because your profile says that you have been training for “about 2 years” yet you speak so hypothetically as if you have years upon years of knowledge. I’m just curious. Have you even tried the Jumpsoles or plyometrics with similiar demands as those put by the Jumpsoles, that you are debunking them. Have you carried out or found any experiments to prove that they are harmful to athletes? And as for KZ, he stretches 4 hours a day yet it doesn’t seem to be so detrimental to his jumping abilities. And as for “elastic energy” watch his videos and notice how he almost always sprints or runs fast before takeoff. That is probably what he is referring to. And any areas which I’m wrong at, whatever…live and learn. But I want to hear what you have to say.