Combining the AB Wheel to your routine of crunches and sit-ups is a great way to get strengthen and firm your ABS in the comfort of your own home. The AB Wheel is proven to tone and firm abdominal muscles and is easy to use, kneel on the floor and place your hand on the bars, roll forward until your back is parallel to the floor without the torso touching it, you will feel the muscles working as you will start to roll back, as the AB Wheel uses your stomach muscle to roll back up while both hands are gripping the side bars of this device.