Try this great Ab Stretching Exercise.
Here's how you do it:
Start by lying on the floor with a towel wrapped around the ball of your right foot, knees bent, left foot on the floor. Hold the towel in both hands and extend your right leg, keeping your foot flexed.
Slowly walk your hands up the towel as you lift your head and shoulders off the floor. Hold for a count of two.
Now lower yourself back to the starting position, walking your hands back down the towel. Be sure to keep your head neutral — don't tuck your chin or tilt back.
Do two sets of ten reps on each sides.
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