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Try this progression to build toward knee jumps--or just practice the simpler variation to train spinal stability and control, if the more explosive movement isn't for you.
Disclaimer:
All videos are for informational and educational purposes only. Consult with a physician before beginning any exercise program. By engaging in this exercise or exercise program, you agree that you do so voluntarily at your own risk. Joe Miller and Joe Miller LLC cannot be held responsible for any loss, injuries, discomfort or damages that may occur from use of information in this video