: Does working other muscles improve recovery? When you work out muscle group A on one day, and muscle group B on another day, does muscle group A benefit from the second workout? I don't mean overlap (e.g., working nearby

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There's a study floating around that shows muscle increases simply from taking anabolic steroids, with no additional workload. So one would imagine that if you did something to yourself that increased your testosterone and human growth hormone, and had enough protein, you'd get (minute but) similar results.

I don't know if there's any research specifically addressing your question though, and I'd imagine the resulting increases would be very small.