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MMA training is really popular and it’s a fantastic workout, Brown says. There is a slightly higher rate of injury than CrossFit, but if you can avoid slipping and falling hard you should try it. MMA has grown in reputation and admiration because people see fights on TV all the time and want to do it. Mixed martial arts training is an effective metabolic workout that also improves balance and coordination, as well as strength. Bonus: These workouts can actually teach you how to defend yourself.