Sit on a mat and place a stability ball between your legs (at your calves/ankles). Squeezing the ball in place, lie back onto the floor, keeping feet just off the ground, knees bent. Make sure lower back stays planted and your abs are tight.
EXHALE: Slowly pull your knees in toward your chest without letting your hips come off the ground or momentum swing you.
INHALE: Slowly lower to start without letting your feet rest in between reps.
You may want to place your arms flat on the ground or underneath your lower back for support.
Muscles Worked: Abs, Inner thigh