Bodybuilding is a type of fitness training that focuses on building muscle mass and strength through the use of weightlifting and other resistance exercises. CALISTHENICS is another type of fitness training that involves bodyweight exercises such as push-ups, pull-ups, and squats. Aerobic exercise is a type of fitness training that involves activities such as running, swimming, and cycling that increase the heart rate and breathing rate for an extended period of time. All three types of fitness training can help improve overall health and fitness.