30 Day Ab Challenge - Best Ab Exercises to Lose Belly Fat Fast Banish your stomach fat with this 30 Day Ab Challenge. This 30 day ab workout challenge is designed to strengthen your core and tone your stomach. Give this ab challenge a try.
Great cardio circuit with or without the treadmill running portion! You could also put these in between other body weight exercises to keep your heart rate up during HIIT (not that you necessarily need more cardio for that!