In 1994, Marla Streb left her promising career as a biomedical researcher to climb onto a bicycle and hurtle herself down the side of a mountain at speeds topping fifty miles an hour. And at the age of 36, she continues to compete and win against women ten years younger at the highest levels of her sport-downhill mountain biking. Astonishingly enough, this is not the most intriguing aspect of Marla Streb. Downhillchronicles her life before racing-her...