EXERCISE WHEEL: Each repetition of the rollout exercise works nearly 20 muscles. It targets your abs, hip flexors and also involves your shoulders, back and several other muscles throughout your body.nDOUBLE-WHEEL DESIGN: Wheels ensure the stability and bear the weight. The surface of the wheel has texture which promotes stability and control. Handles prevent slippage and provide a secure grip.nBEGINNER TO ADVANCED: Build your core progressively by starting from a kneeling position to learn the technique. Once you have mastered the movement roll back, then roll forward to the right and left.nSMOOTH ROLLING: This lightweight, smooth rolling and compact ab wheel is perfect to carry in your gym bag.nWhether you're hitting a tennis ball or mopping the floor, the necessary motions either originate in your core, or move through it. Your core is about more than just your ab muscles, it’s your body’s powerhouse. In other words, it helps you do just about everything. The durable, non-skid Sunny Health u0026 Fitness No. 003 Exercise Wheel provides stability as you extend and roll out to take your abdominal exercises to the extreme. While the exercise wheel strengthens and sculpts your midsection, it also builds muscle in your upper and lower body, giving you the benefits of a fat-blasting total body workout that you can perform anytime, anywhere!