The 21 Best Weighted Ab Exercises For a Stronger Core

This lunge variation works the entire body, and adding the twist ensures that your abs get a little extra attention. You'll especially feel your obliques firing during this move.

• Stand with your feet hip-distance apart. Hold a medicine ball in both hands with your arms outstretched in front of you.
• Take a large step back with your right foot, then lower your body until both legs are bent at 90-degree angles. As you sink into the lunge, twist your torso to the left.
• Bring your torso back to center with your arms straight, and exhale as you straighten your legs. Bring your feet back together, and then step back on your left leg, twisting to the right. That's one rep.