The Sunny Health and Fitness Exercise Wheel is effective in strengthening your core, as it targets your abs and works the muscles of your lower back simultaneously. Your back muscles will be fully engaged in order to counteract the natural arching of your back that occurs as you roll forward on the wheel. Exercising with this wheel requires that your core muscles work together to properly execute the movement, allowing these muscles to contract as a group. This exercise wheel offers variety when you wish to switch-up your current core-strengthening routine. The exercise wheel is convenient, portable and easy to use at home or in the gym. Perfect for traveling or exercise on the go!