You guys obviously have boners for mobsters and that clouds your judgement or else you wouldn't be asking dumb questions with obvious answers (about physical fitness for example).
Common sense 101: Strength and conditioning plays a factor in a fight. In a fight between two groups who are not trained, the group that works out and generally fights much more often is going to win.
300lb fat fucks like the one in the Bronx tale biker bar scene would get their asses handed to them by a biker or anyone remotely competent. As someone else pointed, that fat guy aint't hurting nobody in a fight. You do know the mob HIRES bikers to do their fighting for them and it ain't because the mobsters just don't feel like it? Your opinion is based on nothing more than a preference. You actually throw all logic out the window for the sake of that preference too.