This is a very tough variation of the traditional rollout that can't be done using an ab wheel.
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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Finish off your workout with this series of exercises and get shredded fast.
We've all been there. No matter how big and educated we think we are now, at one time or another we were small.
Get your lifts up, get your gains up, and move the bar faster. Do the clean and press to get better at everything.