Big Mike's Fitness Gliding Discs - Dual Sided Core Slider - Great Trainer Double-sided sliding discs : the big mike's fitness gliding discs are uniquely designed to provide the appropriate amount of grip Great for shaping and conditioning : these exercise discs are used to help extend and strengthen muscles in the chest, back, abs, and arms Strengthen core : the big mike's fitness gliding discs make for the best core slider which will help you achieve those rock hard abs Lightweight and portable : easily stackable and lightweight, you can use them in any situation Get a great lower body workout : the sliders are also great for lunges or tumbling drills like needle kicks and aerials