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Strength training on balance balls is a big part of alpine skiing training but that's mainly to improve proprioception and is often done with a blindfold too :D
A very specific type of exercise for a very specific skill.
Edit: And conducted under close supervision by coaches who know wtf they are doing for, as Dan says, the risk of crippling yourself.
Stonehedge
That sort of nonsense has been going on for ages.
Back in the days that I actually lifted, there was a fella in the gym that would kneel on a swiss ball and do DB shoulder presses.
Probably great for core, but so easy to fall of and cripple yourself