Roger Stewart's Extreme Calf Machine Patent Number D/141,928 Easy to use - patented pivoting pedal for maximum stretch, lightweight-strong and durable portable and non-skid surface. Helps increase the flow of blood and oxygen throughout the calves. Helps develop, shape, stretch, tone and rehabilitate the calf and Achilles Tendon. It also helps to prevent shin splints and works the tibialis. Improves inversion, eversion and balance. Exercise Instructions Included: Standing Calf Raises, Seated Calf Raises, Donkey Calf Raises and Single Calf Raises all in one low cost machine with a LIMITED LIFETIME WARRANTY!!