A bunch of BS, becoming fat is your own mistake nobody forces you to eat as much as you do. Having skinny girls around just motivates the fat people to work hard and lose weight.
If you can't handle that or are to insecure, guess what life ain't easy, and these gyms just motivate being a p*ssy...
Lots of guys wear elastic belts, i personally find them more comfortable then the all leather ones because you can adjust the fit better, but the all leather looks alot cleaner.