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So its not fighting against you. >> and a lot of people will tense up if theyre using a loose ball because theyre worried about it falling to the ground. the muscles relax better. >> its a little awkward for me because im so tall to lean against the wall. >> i would say instead of. >> can you put one foot in back? >> yeah. but you dont have to be arching so much. you can keep your hips a little farther back. when we made the final decision, we tested it out on 300 professional athletes. we teste...