Depends on the girl. My girlfriend is very exercise oriented and so she has a toned, athletic body and I find it very hot. However, I don't like the girls who are so sporty and they have six packs, muscles, etc. That is a complete turn off to me.
I'm not a guy, but I think guys like girls who are athletic.
One of my guy friends his girlfriend is on the volleyball team
and on the track team and she's in really good shape and I know
he likes it. So I'm going to say that it's not a bad thing.
Most guys like it when girls are physically fit and are in shape