The CAP Ab Roller Wheel is an easy-to-use piece of exercise equipment that can help strengthen core and tighten abdominal muscles. At the gym or in your own home, you can use the wheel to help work out your lower and upper back, hips, chest, arms, butt and legs. These wheels are portable and easy to store just about anywhere. Non-slip wheels provide stability and the contoured grip handles allow for a smooth and comfortable workout.