Crunch-hold with both legs up!
To target your core try this crunch exercise:
Lie on your back on the floor. Lift both legs up, with your knees over your hips and your lower legs parallel to the floor. Next, lift your shoulder blades up off the floor to establish your starting position. For more of a challenge, extend both arms straight off the floor along the side of your body. Hold this position for 2 deep breaths or 10 seconds, then release. Do 3-5 reps.
*Consult your physician before performing exercise. This exercise is not for those with back injury concerns.