you stated that you don't want a long term thing, just some fun.
for this reason I would advise you to just stay away. be friends.
reasons:
you both go to this gym. things would be awkward when you to decide to "quit having fun"
you both know alot of people who frequent this gym (your mom one) and they are all nosy types and word gets out quick.
I'm 21 as well, and saw a 26 year old for a while. not that great of age difference, but definately there. Both started out casual just having fun, but eventually she saw herself getting older and wanted to settle down make things more serious.
I dunno though, something tells me your going to do it.
so ill just say live and learn. have fun while doing it!
