Position smith bar upper chest height with platform under bar off to one side. Positioned shoulders under bar and one foot on platform with other leg extended slightly forward on floor.
Raise bar upward by straightening leg and pushing body upward. Lower body downward by returning foot off of bench to floor and repeat. Continue with opposite position.
Keep torso upright and foot flat on platform during exercise. Knee of exercised leg should point same direction as foot. Extended leg can be positioned slight forward.