Enduro racing: The latest in extreme bikingEnduro bike racer Curtis Keene explains the rigorous training needed to compete as an enduro racer.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceEnduro bike racer Curtis Keene explains the rigorous training needed to compete as an enduro racer.Published Dec 20, 2016 | Modified Dec 20, 2016SI STAFFShare on FacebookShare on XHome/Edge