"One Year Body transformation" This boy deserves respect! He was a skiny teenager who decided to do something about it. The result is Awesome! Calisthenics are a form of exercise consisting of a variety of exercises, often rhythmical movements, generally without using equipment or apparatus. They are intended to increase body strength and flexibility with movements such as bending, jumping, swinging, twisting or kicking, using only one's body weight for resistance. So you really don't need to spend your money on expensive working aparatures. Your body itself is enough.