Hanging Leg Raise
Hang from a bar with your legs straight down. Raise your legs by flexing your hips while flexing your knees until your hips are fully flexed. Continue to raise knees toward shoulders by flexing your waist. Do NOT swing and use momentum. Go slow and concentrate on using your abs to pull your legs up. Return to the starting position. Repeat. You can place weight between your ankles for added resistance. You can also raise your knees to one side of your body to work the obliques.