Does anyone know what the wrist machine was? "Jeffries worked with the punching bag, medicine ball, This content is protected , and jump rope, and he also sparred."
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As I understand it, it was a weight-training device for strengthening the grip and forearms. Basically a horizontal bar which you would turn slowly with your hands so that it wound up a rope from which a weight was suspended.
Maybe he worked his hands and wrists opening jars, one after another, for his wife. I'm a pretty strong guy, but I swear, some of those jars my wife gives me to open, the lids HAD TO HAVE BEEN at the very least spot welded in place!