V-UP

Target Muscles: rectus abdominis
Synergist Muscles: iliopsoas, obliques, sartorius

Set Up: Sit with your hands just behind your hips and your legs extended in front of you. Lean back on your hands and lift your legs off the ground about six inches, keeping them straight and together. You should be balancing on your butt.

Action: Keeping your back straight and your chin lifted, curl your knees in toward your chest. Slowly return to the start position and repeat.

Do three sets of 12 reps.