An interesting thing is that female rowers are attracted to the sport and do well at it because females tend to be stronger in their lower body than upper. Rowing power is in the legs. So while it's better for upper body musculature than the bike, not so very much better. Hence the admonition to not let the legs heavily stress the upper body connective tissues until they've become stronger. Wonderful cardio and really good for the back and other muscles that allow one to ride long distances pain-free.
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Results matter