24 Fat-Burning Ab Exercises (No Crunches!)
Plank on the ball
Kneel in front of a stability ball, draping your abs and hips over the ball. Place your hands on the ground in front of you and walk them out until the ball rolls beneath your thighs (as shown above).
Once your body is straight (with a slight arch in your back) and you're stable, hold for 30 seconds. Focus on lifting belly button and squeezing thighs.
Watch the video: How to Do a Plank on a Stability Ball
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