air squat

Jumping straight to the back squat is like trying to do calculus when you don't yet understand basic arithmetic.
All-out effort is the secret ingredient to making the most of a 15-minute session.
If your knees hurt, the true answer is to fix the origin of the problem. That happens here.
Using orthoses is a great way to reinforce what the correct positions are, even when you’re not standing there making corrections.