Originally Posted by
confuzzl3don3
That knee bouncing thing at the top of each rep was something i sort of developed. As you pointed out my older vids didn't used to have it. I found that by fully extending the knee like that allowed me to get more of an eccentric stretch which would help with the pre-stretch of the muscle fibres before the concentric. Basically i found it seemed to help me get a better bounce and come out of the hole. It may be just pyschological, but that's what i've been doing for a while now.