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To avoid discomfort in your knees, try to avoid kneeling on a hard surface. If you want, placing a towel, blanket, or small pillow underneath your knees can ease discomfort. For more of a challenge or for more advanced lifters, you can perform this movement with your legs straight out behind you instead of on your knees.

Upper abdomen, from just above your belly button to your sternum. The upper half of the six pack abs.

Lower abdomen, from just above your belly button to your pubis. The lower half of the six pack abs.

Outer sides of your abdomen.

Largest muscle of your back, spanning from the lower to middle regions creating a v shape.

Outer region of your upper back as well as the back area of your shoulder.

This means that the exercise requires you to use your bodyweight as resistance but you also need other equipment to successfully perform the exercise.

When using the ab wheel, try to avoid pressing down harder on one handle than the other.

Variations

Exercises that target the same primary muscle groups and require the same equipment.