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.
What it works: Frontal abs, lateral abs, core. Tip: For fastest results make sure you pull in your lower abdomen which performing ab-strengthening routines. This flattens the muscles and helps align them better, increasing the pull being exerted.