7 Weighted Ab Exercises — For When You Really Want to Torch Your Core

As you lower your legs, you'll fight to maintain core stability (keep pressing that belly button through your spine to the floor!), strengthening your upper and lower abs.

• Lie on your back. Holding a weight with both hands, and reach your arms toward the ceiling.
• Bring your legs toward the ceiling, keeping both knees straight. This is your starting position.
• Lower your right leg toward the floor, keeping your lower back touching the mat.
• Lift your leg to return to the starting position. Repeat on the opposite leg. That's one rep.