Gymnasts put chalk on their hands, and occasionally their feet when competing on the balance beam, to keep their hands from slipping off the apparatus from the sweat. Particularly when competing on the bars, your hands get sweaty from the constant friction and long lasting contact with the bar.
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I'm a gymnast and I wear a "wrist thing" (wrist guard) on my wrist to support it. They can wear it because of past injuries like overusing it.