- Hang from a pull-up bar with an overhand grip and your hands about shoulder-width apart. Flex your hips and bend your knees, holding them above your hips in front of your torso.
- Now roll your torso upwards, bringing your knees toward your chin. Slowly reverse this motion without allowing your knees to become un-tucked from your body. Don't use momentum.
The way these exercises are usually performed – with your legs hanging down and flexing at your hips – is primarily a hip flexion exercise. Tuck your pelvis and you'll target the abs much better.