Tip: The Standing Barbell Rollout

Grip width can alter the emphasis of the working muscles in the ab rollout. Using a wider grip will work the chest and shoulders to a higher degree, as the arms will end up in a less stable position at end range.

The abs must work hardest with a narrower grip; it keeps the arms longer, which allows the bar to travel further away from the knees or feet at end range (more distance to bridge and maintain proper position.)