How to Do Crunches So They Actually Work Your Abs

Taylor says these leg lifts, also called reverse crunches, are one of her favorite crunch variations. Here's how to do them.

• Lying on your back, lift your legs in the air with your knees bent at about 90 degrees. Place your hands on the floor beside your hips.
• Without momentum, use your lower abs to slowly curl your hips off the floor and into your chest. Slowly lower them back to the starting position.
• That's one rep.