Adjust the sled machine to a comfortable weight. Sit on the sled machine with your back against the pad and your feet on the platform. Place your toes and the balls of your feet on the edge of the platform, with your heels hanging off. Push the platform away from you by extending your ankles, keeping your knees slightly bent. Continue pushing until your calves are fully contracted. Hold the contraction for a moment, then slowly lower the platform back to the starting position. Repeat for the desired number of repetitions.
GIF
