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

This move adds even more challenge to the previous move (leg lowers) by sneaking in a crunch, and moving your hands holding the weights farther from your center.

• Lie on your back. Hold a weight with both hands.
• With your left leg bent and right leg out long, bring your right toes toward the ceiling. Reach your arms, still holding the weight, toward your toes, "crunching" up and lifting your shoulders off the ground. This is your starting position.
• Lower your arms and right leg toward the floor, reaching them toward opposite walls. Ensure your lower back continues touching the mat.
• Lift your arms and leg to return to the starting position. That's one rep.