RT Journal Article SR Electronic T1 Fitness within sport. 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 46 OP 49 DO 10.1136/bjsm.11.1.46 VO 11 IS 1 A1 V. Thomas YR 1977 UL http://bjsm.bmj.com/content/11/1/46.abstract AB