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Well I am a gym rat and I would imagine that it would work pretty well on forearm strength and muscle contraction speed. If you stand with your fists infront of you and squeeze flex, pretty much your arms,shoulders, and chest contract. Part of building some decent muscle is quick twitch fibers..they account for explosiveness.
So yeah if you used it enough, you would tone up the muscle inside, but unless you have decent body fat percentage, not like you are going to be ripped. However not bad if you want to choke a young fucker with one hand.
Honestly, all I can think about when I watch it being used...is the lactic acid burn that mother fucker must create in your forearm.
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