Bird dog crunchThe Bird dog crunch works your abs, but you also get a bonus workout for your glutes, hamstrings, and shoulders. Do five to ten reps on each side.

The starting position is on your hands and knees. Place your hands directly below your shoulders and your knees directly below your hips.

  1. Extend your right hand out in front of you at shoulder level while extending your left leg behind you are hip level.
  2. Bend your left knee and bring it under you while bending your right elbow and drawing it in to touch your left knee under your stomach.
  3. Extend your right hand in front of you and your left leg behind you.
  4. Return to your starting position.