Performing the: A Step-by-Step Tutorial Smith Seated One Leg Calf Raise
Place the balls of one foot on a raised surface, like a block or weight plate, with your heel hanging off the edge and the other foot resting on your knee.
Slowly lower your heel as far as you can, feeling a stretch in your calf muscle.
Push your heel up as high as possible, contracting your calf muscle at the top of the movement.
Lower your heel back down to the starting position and repeat the movement for the desired number of repetitions, then switch to the other leg.