8 Trainer-Recommended Isometric Ab Exercises to Light Up and Completely Exhaust Your Core

Instead of rolling right back to the starting position, hold in your extended position in this rollout, Eric and Ryan said. You'll feel the burn all through your core.

• On your knees, hold the ab wheel directly below your shoulders.
• Roll the ab wheel forward slowly, engaging your core as you do. Roll forward until your arms are fully outstretched and your back is flat.
• Hold for five to 30 seconds.
• Use your core to pull your arms back in, rolling slowly back to the starting position.
• This completes one rep.