RT Journal Article SR Electronic T1 Jim Fixx “Second book of running” JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 29 OP 29 DO 10.1136/bjsm.15.1.29 VO 15 IS 1 A1 Wendy Dodds YR 1981 UL http://bjsm.bmj.com/content/15/1/29.abstract AB