Although I admit that my main motivation for originally joining a gym was because I'd always been on the skinny side and felt this probably wasn't attractive,once I joined a gym it stopped being my main motivation.
My main motivation was just the sheer buzz of the after effects of going to the gym.
I used to finish work at about 2pm, -I was a tube driver-go to the gym and go into central London.
During the walk from the gym to the tube station I felt as if I could do just about anything.*
It was a great great feeling . I think a big part of going to the gym,for me at least, was that it was the only time I'd done anything too physical during the day and the mental feeling a man gets after doing physical 'work' just isn't the same as the mental feeling he gets after a day in an office.Or driving a bloody tube train.
*the can of lager I used to drink in the shower probably contributed to this