The 10 Best Ab Exercises to Strengthen Your Core

Planks are a great way to engage multiple areas of your core at once. This hold activates your rectus abdominis, obliques, and transverse abdominis. "Planks are a must if you want a strong core," says Abdelhamid.

1. Begin in a tabletop position.
2. Bring your shoulders over your wrists.
3. Lift your knees and walk your legs out until they're straight.
4. Press into your palms and rotate your elbows into the midline of your body.
5. Press into the balls of your feet and pull your rib cage up and in.
6. Hold for 30-60 seconds and then release.
7. Repeat 3 to 5 rounds.