exercise or working out inquiry

full story - i was browsing the random section of 4chan and stumbled upon a thread where folks were posting pics of guys who looked like girls, which then evolved into general crossdressing photos. it got me thinking why not? so i uploaded a few pictures and spent about fifteen minutes soaking up compliments on how good I looked (lol, please ignore the ego trip). the most bizarre comment I received was “i’d hit that so hard you’re bones would turn into diamonds” which made me laugh quite loudly.

so anyway i went to take some updated photos and they just didn’t look as good. it seems i’ve put on a few pounds over winter that haven’t worked off yet.

but here is the real question - last time I exercised seriously, I actually gained weight and developed a more masculine build because I built muscle mass. how can someone exercise to lose fat without bulking up? I’d like to maintain my current girlish frame (and maybe even restore the one I used to have >_>).

no suggestions about digestion or avoiding digesting plox unless they are purely food-related.