Since I have been swimming, I too have got a bigger upper body and most of the girls I speak to say the same. I would say that it depends on the most predominant muscle fibers you have, whether is be fast twitch or slow twitch…
Only a suggestion, i’m not trying to be a know-it-all.
Thought I’d just clear that up after reading the slanging match going on here.
Very amusing tho.
Ironbaby.