I did a quick search and couldnt find an answer to this so I'll throw it out. Is it possible to gain muscle mass while training just martial arts? I see a lot of the better fighters in my class and most of them have pretty good muscle mass and are pretty ripped. I've asked all of them and none of them lift either. I'm about 5'9" and weigh 155 lbs. I'm pretty lean but I would like to put on about 10 lbs of muscle mass. How can I go about doing this? I train martial arts enough so I don't have the time or desire to lift weights.