Pure Strength Calf is a machine designed to facilitate activation of Gastrocnemius and Soleus calf muscles without stressing the spine. The elliptical shape of the platform allows maximum articular excursion and muscular involvement, even at the end of ankle range of motion. A secondary pre-start footplate protects taller users from excessive knee flexion when getting into exercise position. Recommended for calf muscles, without placing any undue stress on the spine with applications for articular excursion and muscular involvement even in the last degrees of the ankle range of motion.