I was a boxing fanatic in my younger years. Saw many big fights in England 1945-1954. I read of a huge underground facility in England during the cold war. Later it was turned into a research storage area of deceased persons brains. Contained in jars.
Boxers were identified. To my concern, all had brain damage. Most suffered from Parkinson's disease. Fine looking athletic men at the time of their heyday. I have not watched or paid to see any boxing since.
My hobby is FR and American Western History. (oh oh! too much of a ramble by me)
But it's interesting to look at bios of old famous actors/entertainers and read how many were pro boxers for a period time in their younger years. Bob Hope for example.