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Plus there are plenty of videos around of this stuff being done. I've heard of at least one study on it, which was all about proprioception. Pretty pointless as you can get the same level of activation by putting the weight overhead without the crappy shear on your ankles and knees.
how stupid. Ive seen those balls burst under far less load let alone the other reasons why this is dangerous and stupid. That personal trainer should be sued by the guy who is sueing nintendo.
my gym has a personal trainer like this, hes about 120lbs soaking wet and does this kind of crap with his clients, personally if I was the gym owner I would not let him step a foot in my facilities.. these kind of exercises are just asking for a injury/law suit.
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