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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Sit on the floor, get a full stretch of the lats, then pull with your elbows as far behind you as you can. Arch your low back and get your chest out.
Elevate the front foot with a step and go deep on this one. Rack grip shown, but you can also hold the dumbbells down at your sides.
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Dr John Rusin September 15