Stefani that is! Let's grab Gwen's beautifully chiseled abs with this core building workout. If you've got a stability ball, great. If not, no sweat, you can go through the motions just as well without it. Let's burn!
✓ Earn points, compete on the Leaderboard, stay motivated!
✓ Scheduling to fit your busy lifestyle
Recommended Gear
Do this workout with the best exercise equipment. We recommend using a bluetooth chest strap heart rate monitor or a smartwatch for more training optimization & performance tracking.