GoFit Gravity Straps Suspended Body Weight Training System with Carry Bag and Bob Harper Training DVD Nylon Gravity Straps help bring suspended body-weight training home for users of all fitness levels. Included Bob Harper Gravity Straps DVD gets you started and keeps you motivated on the road to your fitness goals. Simple system fits over any standard door frame. Great for full body workouts Includes handles, leg straps and carry bag in addition to DVD.