Belly wheel

The ab roller is an excellent exercise for working the upper body musculature too, including the erector spinae, the stabilizing muscles running the length of your spine, the latissimus dorsi (or lats), the broadest muscles on each side of your back, and your deltoids (shoulders), chest, biceps and triceps. The lats and shoulders are stimulated primarily during the rolling out phase, while your core is worked during the secondary, rolling back stage. Remember, a stronger core benefits the body's daily function in many ways, such as torso rotation and flexing, as well as protecting your spine.