Chess boxing is exactly what is sounds like.
The sport combines four-minute rounds of blitz chess alternating with three-minute rounds of boxing. It lasts until there is a checkmate or a knockout.
The hybrid sport, which is gaining attention in the United Kingdom, combines “the mental workout of chess with the physical challenge of boxing”.
Basically, you play a few minutes of chess to get your brain stimulated, and then you get into the ring for a few minutes to get your brained smashed.
The hybrid sport is governed by the World Chess Boxing Organisation, and held its first world championship in 2003.