展开Only 2 in 1 belt that can tone both your abs and butt muscles anywhere, anytime. While different types of workouts only activate about 30% of your muscle fibers, leaving the other 70% dormant. The Zip & Tone belt dual zipper action helps maximize muscle activity during your session. Get up to 770 muscle contractions in a 10 min. session, training even the most stubborn muscles of your abs & butt. Open the zipper, strap in, and let the belt do its job. It’s also cordless, so you can use it anytime, anywhere.