Belts come in handy here for improvising a dodge-ball training target
This mitchmen team have a very efficient way of testing the resilience of new recruits.
Its' no good going in for contact sports if you can't take the knocks!
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I love this picture, the simple arm and wrist restraint is so effective both visually and practically and the sense of unexpected combination of helplessness and bizarre threat in a gym of all places is superb. It's hard to credit but it's from Kink.com.
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Image of Adam Knox, from Bound In Public, Arrogant Gym Rat punished (incl video clip)