One of the fastest growing sports in the country, mixed martial arts (MMA) draws upon elements from various combat sports such as wrestling, boxing, Muay Thai, jiu-jitsu, and karate. This intense method of training develops skill and agility along with strength, endurance, and power. The dynamic, high-intensity, total-body workouts are perfect for building a lean, athletic body, says Nick Tumminello, a personal training continuing education provider and owner of Performance University. “Plus it's a new and interesting way to train, which appeals to everyone.”