Learning the warrior mindset you need in the ring will change your perspective on a lot of things in life. And it will keep you in excellent shape, minus injuries.
Seconded. I spent a couple years training Muay Thai before getting bitten by the BJJ bug. I'm trying to fit in more standup again now, but I still try to spend at least an hour every weekday on the mats.
Having a very physical hobby keeps me grounded in reality after spending most of the day thinking about philosophy or writing or coding (I'm a student). There's a lot of pretty direct feedback about your improvement over time, too, which I find can be lacking in more intellectual pursuits.
Learning the warrior mindset you need in the ring will change your perspective on a lot of things in life. And it will keep you in excellent shape, minus injuries.