If You Misunderstand This 0.1 Millisecond Period You Will Never Train Optimally

Guys, I found the secret to a 60-in vertical. The quasi-isometric window. I found just how to train it. Can you guys help me out real quick? When you jump, there's a brief isometric condition right here, and your muscles are doing other fancy things at the same time. So, we need to attack this. All right, guys,

I'm going to squat, and I'm going to hold the bottom. I want you guys to just yank on that thing, all right? Ah, harder, guys. Yank on it. Ah, I feel my isometric quasi-isometric window adapting. >> Now, what in the hell is Yin's doing here? We got to have a talk about this

damn quasi-isometric window. Now, y'all listen here, okay? This that you're doing ain't going to make you jump higher, cuz you got to train both the up phase, that concentric, that eccentric, and that quasi-isometric. And I'm going to teach you that in this here video. >> Researchers put an ultrasound probe onto an athlete's calf, had them perform a

squat jump, and tracked the fascicle length in real time. Right as the athlete hits the bottom of their squat during the amortization phase and starts pushing upwards, they noticed that the muscle is not shortening at all. In reality, the tendon is doing all of the mechanical work. This was the data that three researchers collected and

published in the Journal of Applied Physiology in 2001. >> I'm John Evans, and I have coached many of the highest jumpers in the entire world. This includes two of the former world record holders, Isaiah Rivera and Dylan McCarthy, along with two other individuals who have tested 50-in vertical jumps. I've essentially been creating content on how to jump higher