- Grip a chin up or pull up bar with a firm overhand grip.
 - Hang from the bar with your legs straight.
 - Raise your legs by flexing your hips forward and bending your knees up towards your chest.
 - Continue to raise your knees towards your chest by flexing your waist forward. Don’t swing your body to use momentum. Use your abdominals to pull your legs up.
 - Return to the starting position, lowering your legs slowly until they are straight.
 - Repeat.
 
For added resistance you can wear a dip belt with weight suspended from.