An elbow plank should only be performed if you can successfully engage your abs in a side plank.
- Start face down on the floor, resting on your forearms and knees.
- Push off the floor, raising up off your knees onto your toes and resting mainly on your elbows.
- Contract your abdominals to keep yourself up and prevent your booty from sticking up.
- Keep your back flat — don't let it droop or you'll be defeating the purpose. Picture your body as a long straight board or plank.
- Hold for 10 seconds. This completes one rep.
- Do one set of three reps.
- As you get stronger, begin to build up to 30 seconds.