thanks for the replies... i was asking because i just got my first road bike a week ago... the last bike i had was given away 6 years ago when i was 18... it was a Huffy mountain bike... i'm not over weight but i am not in great physical shape either... cycling is not at the top of my priorities but i try to ride at least 4 miles per day since i got the bike... but on rides that last for more than an hour, i find my back sore... it's not the bones that are hurting, it's the back muscles... so i don't know if it's just my body trying to get in shape... the bike is actually becoming more and more comfortable as i use it... at first i had the saddle set really low since i wasn't used to a road bike, but then my butt started to hurt, so i raised it up considerably and i could tell a major difference... i was just asking because everytime i ride the road bike at the park, i see all these people on comfort bike looking all relaxed...