Who in their right mind would tell a person to back-squat on a stability ball? The dude's stabilizing muscles aren't going to engage when he starts to lose his balance, they're going to crash to the ground with the rest of him as he sends that loaded bar flying in one random direction or another. Insanity.
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LOL at that dude who thinks he's spotting that lift.
LOL at that dude who thinks he's spotting that lift.