ALL FIT:Episode 5 FLEXIBILITY Slim explains how the bones, muscles, and joints allow the body to move in a free and smooth motion. Slim joins Slenda and the all Fit Team at Slim's Gym, Slend... more »a leads the all Fit Team and viewers in a warm-up and flexibility exercise. Slim then works to identify everyday activities that require flexibility. In the Body Lab, Slim shows viewers how muscles and bones move at the joints. He demonstrates that hinge joints allow bones and muscles to move back and forth, while the great ball and socket joint provides the widest range of movement. After explaining the relationship of muscle length and flexibility, Slim names and locates the hamstring muscle.« less