How do the characters in the Harry Potter series manage to stay so fit?

In the Harry Potter series, most of the characters tend to be reasonably fit, some skinny. And yet, how is this possible? There is no mention of any workout room in Hogwarts, and casting spells doesn't seem to be real activity. There are three huge meals a day, and the only sport is Quidditch, which isn't really active, just sitting on a broom.

How do you think all the characters manage to remain so fit?

Have you seen the size of that castle? There are 142 staircases!

I suppose that's why you only see a few chubby Slytherin's (Crabbe & Goyle) because their common room is in the dungeons so they don't have to walk up hundreds of flights of stairs to get there!

umm are you sure qudditch is just sitting on brooms??? i mean, they toss balls around, they dodge bludgers, they fly at incredible paces! there are tons of staircases!!! the north tower, where they have diviantion classes, they are sweating by the end of the climb! and the trip to griffindor tower!! http://answers.yahoo.com/question/accuse_write?qid=20081128185038AAJrYkd&kid=P4NsPHHcMEghuEbL5DED&s=comm&date=2009-01-07+13%3A35%3A22&.crumb=

Walking around on that huge campus all day probably is a good workout. Not to mention those changing stairs. Think about getting stuck on a floor where the only way to get back was by finding an alternate path. It would definitely not be fun.

Magic :]

Lol, probably magic, yes. (Remember how Hermione used to have buck teeth but with magic her teeth shrunk?) Or some people are naturally thin ... we don't all have the same body type.

thats a good question...I mean didnt you see all that food on their lunch tables...and your right..there days arent activity filled...so I agree with the person above...Magic maybe

Dude......they're wizards......