So I'm starting at a martial arts/fitness studio in a few days. They offer several different programs (Krav Maga, Crossfit, MMA training, groundfighting are the ones I'm interested in). Right now my work schedule is 24 hour shifts on Tuesdays and Thursdays. 1. Can I substitute taking these classes for lifting? For example if I do KM 2x a week, Crossfit x 1, and MMA x 1? I understand that CrossFit will probably give me a good ass-kicking, which I am looking forward to. 2. If I go to this place 4 times a week and run/swim on the side, am I overtraining? 3. Am I stretching myself too thin by trying too many things at once?