You can't make people smarter. You can expose them to information, but your responsibility stops there.

I can teach idiots to squat in ten minutes.

On 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.

Since the trainee is both inefficient and unadapted, only a few basic exercises should be used, and they should be repeated frequently to establish the basic motor pathways and basic strength.

You do not need to do many different exercises to get strong - you need to get strong on a very few important exercises, movements that train the whole body as a system, not as a collection of separate body parts. The problem with the programs advocated by all the national exercise organizations is that they fail to recognize this basic principle: the body best adapts as a whole organism to stress applied to the whole organism. The more stress that can be applied to as much of the body at one time as possible, the more effective and productive the adaptation will be.

The BEST training program in the entire world will be a DISMAL FAILURE if people fail to hold up their end of the deal. The success of ANY training program is ultimately the trainee's responsibility.

Your muscles cannot get "longer" without some rather radical orthopedic surgery.