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Judo, which is wildly practices everywhere outside of USA, builds grip strength by constants practice. And at least here in Europe almost every small community have a Judo club where hordes of children attends. And Judo has been in the Olympics for a long time.

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Jiu jitsu practitioner here - we also tend to develop grips of iron from constantly grasping the Gi (very thick, coarse kimono worn as a training uniform). Both judo and it’s sister sport jiu jitsu will develop your musculature insanely fast.

I have a friend who trained for a while with an instructor in a traditional form of Scottish wrestling. When he left his instructor gave him a sleeve that had been cut off of a BJJ gi so that it could be slung over a pullup bar and gripped to do pullups.

Oh yeah I do that one too - that’s a fantastic exercise! Also a good use of an old beat up gi that would otherwise get thrown out

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