This is a very tough variation of the traditional rollout that can't be done using an ab wheel.
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With only one working arm, your body is forced to resist rotation. It's extremely challenging for the chest, shoulders, and lats.
The length of the barbell makes it difficult to keep the bar rolling straight, so it will also build wrist strength (radial and ulnar deviation).
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Build your lats with this unilateral pulldown variation. You'll get a growth-inducing stretch at the top and a hard contraction at the bottom.
There's an old saying that goes, "Give a man a fish and feed him for a day, but tell him about periodization, and confuse him for the rest of his life."
The best exercises for building a big, strong back and the best way to perform them. Check it out.
Knowledge is power, but knowledge can also be limiting. Real progress occurs when you harness the power of the belief effect.