This exercise has cardiovascular benefits in addition to strengthening your abs.

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Directions

1) Lie on your back with your right leg fully extended. Your left leg should be bent at the knee, foot on the floor.

2) Place your hands behind your head with elbows bent, taking care to keep your elbows open to the ceiling.

3) Lift your head slightly off the floor while lifting your right leg 2 feet off the floor. Keep your leg straight as you lift.

4) Repeat for 10 reps. Then switch legs. Build to 25 repetitions.