The Ultimate Ab Workout Plan: Week 4 Exercise Instructions
- Get on all fours with the step behind you, keeping your arms straight with your hands directly underneath your shoulders. Press your toes into the step.
- Tuck your left knee in toward your chest then extend it behind you. Do 10 reps of this tuck-and-extend motion before switching legs.
- Squeeze your glutes as you extend your leg behind you. After you've done 10 reps, switch sides so your left leg is on the step and your right leg is tucking and extending.
Originally published on FitnessMagazine.com, June 2008.
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