Adjust the seat of the sled machine so that your knees are at a 90-degree angle when your feet are on the footplate. Sit on the sled machine with your back flat against the backrest and your feet shoulder-width apart on the footplate. Grip the handles on the sides of the seat for stability. Push against the footplate to extend your legs, straightening them completely. Pause for a moment at the top, then slowly bend your knees to lower the footplate back to the starting position. Repeat for the desired number of repetitions.
GIF
