labor and fitness

Moms who stayed active and exercised during your pregnancy - do you feel like it helped your labor and delivery? From the research I've done it seems like it can definitely make a difference. People (mostly people who never exercise) keep telling me it will not. Obviously, things can be hard and go wrong for people who are fit and people who aren't can still have great deliveries - however, for the majority of people I think it does make a difference.