Obviously and correctly, physical fitness has a high priority in today's Army. I left in mid-70s after full term + and fitness was not then a priority. Annual test was easy. No regular training that was fitness-oriented. My grandfather in 1900s worked on 'eat and drink with men, sleep with women and pray to God to keep your bowels open' My pre-39 Regular uncles seemed to rely on long route marches but just that - not tabbling by any means. There were still some Arnhem guys in at my time and they said that determination not to be beaten was main factor in that time. I.e. - spirit not physique. Same sort of thing from ex-Jap POW. They said desired fitness came just from surviving. So - what brought about this drive to fitness? Spread from jogging into HM Forces? Some blokes arriving fat and unfit in Falklands? We now have a more mechanised set-up so old (mostly ignored) idea from my time that you had to run to get away from enemy does not hold water.