This exercise is a ground-based abdominal strength exercise that targets the lower abdominals and increases core stability.
Lie flat on your back with your feet off the floor. Your legs should pulled toward your chest and your knees bent at 90 degrees. Your arms should be extended straight and behind your head. Keeping feet together, open your knees to a 45-degree angle.
Squeeze your abs and lift your hips off the floor and roll them towards your chest. Pause and slowly lowering your hips back to the starting position.
Use a controlled movement to tuck knees to chest. Do not use momentum.