There are few sounds more blood-curdling than the slap of a kick to the calf.

Akin to the sound of slamming a ruler on a desk, it rings out through the arena inducing grimaces and gasps from the crowd. It's not the sound itself that draws the reaction, but the action that accompanies it. The slap of skin on skin leaves the audience with no doubt about how well the shot connected – the louder the slap, the cleaner the kick; and they always sound worse in person than on TV.

It's an important weapon in kickboxing and mixed martial

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