Pretty much all group fitness classes tend to be majority females and spin is no exception, so it's not exactly a fair competition for a guy unless you are really out of shape. That's kind of what doesn't really interest me in the competition based ones like flywheel.. There are probably a few dozen cycle classes but the one I go to is my most "safe haven from fatties" location. There are at most 1-2 smallfats in any class of 45-60 and no deathfats. Even my regular gym has 2 deathfats :(.