Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products. Something we hope you'll especially enjoy: FBA items qualify for FREE Shipping and Amazon Prime.If you're a seller, Fulfillment by Amazon can help you grow your business. Learn more about the program. Combine two or more bands for a custom weight tension resistance up to 100 lbs. Allows you to customize your upper body and lower body workouts to meet your training goals. How to use it? 1. Bind belt to the ankle 2. Set the hasp 3. Accomplish The resistance band is light and small, easy to carry, you can exercise anywhere, Home, Gym, Outdoor, etc. Exercise anytime, anywhere. Relaxing & Training!