Travis has a article under The Prospect that is just great. It details what it takes to be a pro. The dream can turn in to a nightmare if you let it. A quote from the article that shined:
This year I re-strained my ankle, had a severe concussion, lost consciousness in one race, tore cartilage in my chest, severely tweaked my knee, got strep throat, cam down with the flu, tackled a Tuff Block at 40 mph, developed chronic sinusitis from inhaling too much dust and tore my back badly enough to keep me from walking for more than a week. And even though I won the 125cc East SX title this year, I still managed to catch a lot of criticism for pulling out of two 250cc races "for no reason."