With the ab wheel, you will strengthen your abdominal muscles and the entire upper body, while also improving your balance. Proper technique is essential to avoid muscle strain. Kneel on the floor, grab the handles, and with your abs tightened, roll the wheel forward as far as you can, keeping your torso straight. 

Use your abs, not your hips, to return to the starting position. Rolling is considered one of the most challenging yet effective abdominal exercises.