How to Do Crunches So They Actually Work Your Abs

This hollow body hold challenges you to find stillness (easier said than done). The move is simple enough, but you'll definitely feel the burn.

• Start on the floor, with your legs straight and your arms extended overhead.
• Press your lower back into the floor and inhale to slowly lift your shoulders, arms, and legs off the floor, engaging your core and keeping your lower back pressed down.
• Hold for 30-60 seconds. You can also bend your knees if it's too hard to keep your legs straight.