The hang clean is unweighted and is of little use to watch, except that it shows a problem known as a Donkey Kick. As the jump occurs, the heels come up in the back and then stomp back down into place. This is a terrible waste of time and energy, and contributes nothing to making the bar go up. Stop doing this immediately or I will have you killed.
Mark RippetoeStrength is an excellent example of a physical characteristic that drives improvement in other athletic parameters. More strength means more power, more endurance, better coordination, and better everything else. This is why, all other things being equal, the stronger athlete is the better athlete.
Mark RippetoeOn resting in between reps: It varies with the length of the set. 5s or fewer get a breath to reset. Longer sets might take 2 breaths. During the last few reps of a true 20RM squat, just do what Jesus tells you. Trust me, if you do an honest 20 rep program, at some point Jesus will talk to you. On the last day of the program, he asked if he could work in.
Mark Rippetoe