I've bolded a few of the things that I think people are overlooking. These may be MORE important than the "helps you shallow it in transition." Heck, not everyone needs to shallow it, but a lot off people need more of those two bold things.
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Yeah, because he's letting himself swivel. Nobody's saying the arms "floating in space" would contribute power, but the arms acting off a stable platform provide the majority of the power.
For most people anyway.