Dreyer, Danny. Chi marathon : the breakthrough natural running program for a pain-free half-marathon and marathon / Danny Dreyer and Katherine Dreyer. - New York : Touchstone Book, c2012. - xxii, 292 p. : ill. ; 24 cm. Includes index. ISBN: 9781451617955 9781451617993 LCCN: 2011038844 Subjects--Topical Terms: Marathon running--Training.Tai chi. LC Class. No.: GV1065.17.T3 / D74 2012