Dog sledding, is it a real sport?

How is the person who sleds with the dogs work? How is this a sport for him? I mean I understand the dogs run but what does the person does that make this like a sport or a workout for him? I really need to know because I'm considering buying 6 husky puppies and breeding them to grow into strong sled dogs so we could enter competitions and such. Tell me if this is a hard or good sport?