Celtics star Jaylen Brown expresses his desire to partake in something like UFC or boxing after his NBA career ends. (0:38)Open Extended ReactionsBoston Celtics star Jaylen Brown says he has "toyed" with the idea of competing in combat sports once his professional basketball career is finished. "To be honest, I've toyed with this and I've talked to some people," said Brown, who has training in Muay Thai. I've talked to Dana White about some stuff, but we'll see as things go on. Brown is a five-time NBA All-Star and the 2024 NBA Finals MVP.