Calisthenics are a form of exercise to increase body strength, body fitness and flexibility through movements using one's body weight for resistance. When performed vigorously and with variety, calisthenics can provide the benefits of muscular and aerobic conditioning, as well as balance, agility and coordination. Interested to give it a try? Start here.

Push-ups are great for your chest, but do a great job of defining your triceps, shoulders, torso, and abs too.