Sit on the platform and put your feet on the support bar. Lean forward and grasp the handle. Straighten your legs until they are just slightly bent and keep them motionless throughout the exercise.
Straighten your back and pull the handle to your abdomen, keeping your elbows close to your torso. Arch your back at the end. Your torso should be almost vertical, do not lean back too much.
Hold this position for a moment and slowly return the handle to the starting position above your feet.