Instructions:

1. Adjust the sled machine to a comfortable weight and position yourself on the machine with your toes on the platform and your heels hanging off.
2. Place your hands on the handles or the sides of the machine for support.
3. Engage your calves and slowly raise your heels as high as possible, pushing against the resistance of the sled.
4. Pause for a moment at the top of the movement, then slowly lower your heels back down to the starting position.
5. Repeat for the desired number of repetitions.