It was John Carney that first showed me this drill. He called it the “Tower of Power”.
Free hips should be first taught on a strap bar. When you move to the competition rail, instead of spotting, let them learn it by themselves.
Click PLAY or watch it on YouTube.
The drill encourages kids to keep their Centre of Mass as far away from the Bar as possible on the DOWN swing. And gives them plenty of practice on the grip change long before they need it for Giants.