Chess Boxing

My favorite new sport: chess boxing. It's a real thing. Really. The rules (via a really long article on ESPN.com):

Two competitors face each other in 11 alternating rounds, six of chess, five of boxing. A bout begins with chess, which is played on a board placed directly in the middle of the ring. Each round of chess lasts four minutes. After each chess round, the bell sounds, and workmen remove the chessboard for a two-minute round of boxing, the gloves go back on, the punching recommences. Participants win by way of knockout, checkmate, referee's decision, or if his opponent exceeds the allotted total of 12 minutes for an entire match on the chessboard.

Here's my first question: Since you'd need to be good at both, would it be harder for a good boxer to get good at chess -- or for a decent chess player to get good at boxing?

Second question: What other sports not normally associated with like skills could be combined to increase viewer interest? Snow skiing and rifle play? Oh, that's already a thing. How about Ultimate Fighting and Taboo? Or Sumo wrestling and soccer? Or competitive eating and synchronized swimming?

Now that's some Olympics I could get into. Your ideas?