Russian men are risking brain injuries taking part in the seriously brutal sport.
You've heard of UFC and MMA but have you heard of slapping competitions? This sport is seriously violent and it's all about causing real, serious pain.
Opponents face off slapping each other in turn, continuing until one of them surrenders from the pain.
Competitions have been taking place in Russia, with the most recent in April this year taking place at Sarychev Power Expo - an event focusing on power sports, patriotism and Russia's strongest men.
The winner at this competition was Yuriy Kuzmin from Nizhny Novgorod who accepted his prize of 25,000 Rubles after enduring hours of slapping. If you're thinking that doesn't sound too bad, consider the fact that 25,000 Rubles sounds a bit less impressive once converted into pounds - it's just under 300 quid. We'll stick to football, thanks...