20-Minute Ab and Butt Workout Guaranteed to Leave You Sore Tomorrow

Reps: 12 each side

• Stand with your feet slightly wider than hip-width holding a 10-pound dumbbell.
• Squat and twist to the right, bringing the weight to the outside of your right knee.
• Exhale and twist to the left while raising your arms overhead, pivoting on your right foot. This completes one rep.
• Do 12 reps on each side.

We love a full-body ab exercise for functional fitness, and this move works the entire middle of your body, firming the muffin-top area.