If you think about it though many people are biased against a pianist with muscles.
They see an athletic lean girls or guy with muscles and they think he/she must be superficial all muscle and no brain.
The conception that you cannot have muscles and brain seems to never go away. I have never understood it myself, as in order to train your body, you must train your mind as well or much effort will be wasted.
Whilst i have been athletic in the past, i never played the piano much when i was hard training. This is not because the two were contradictory, but because i always felt that both required and deserved 100% attention.
I see no reason why a pianist should not have great bodies, but due to the desire and effort required by both disciplines, I do not ever forsee anyone winning the Tscaikovsky and the Mr Olympia in the same year. Saying that, if memory serves, the great Albert Beckles was a rather good pianist and almost won the Olympia.
Thal