I personally train BJJ 3-4x/week and Muay Thai/MMA 1x. All men who are physically able to do so should train some form of martial arts and ideally get a level of baseline competence in both striking and grappling (and by "physically able" I mean "don't have some sort of permanent disability that precludes it"; if you're 300lbs and at the beginning of your self improvement journey don't fall into the "I'll start training once I'm in better shape" trap--start now, supplement with lifting and cardio, and you'll be surprised how quickly your fitness comes together).
