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Kettlebells have a long history among old school strongmen, weightlifters, circus performers, special operators, and countless other tough-as-nails men and women.

The reason why is simple:

The kettlebell is one of the most versatile tools around for building strength in every nook and cranny of your body. Combine them with bodyweight movements and you’ve got yourself a system that can forge bold new strength and crush endless amounts of weakness from here to eternity. Here are 4 ways YOU can use kettlebells (and bodyweight) to boost your strength from here to the moon.