Claire Irons is an established bodybuilder , and she decided to take on the Onlyballkicking 500 knee challenge! And here's the craziest part - she treated it like a workout! I mean, the sheer amount of leg power she has is incredible. She unleashes a relentless barrage of knee strikes on her unfortunate target, reducing his testicles to nothing more than a mere punching bag . We bet that he won't be walking straight for a while, LOL !