As someone who has been out of the RAF for quite a while now this fitness training does not affect me but it seems to me that the lessons learnt during the Falklands War in 1982 have long been forgotten. Read any book written about the war and you will find that the first people to fail were the super slim fit ones. They had insufficient reserves of body fat to cope with the cold and long hours without food. Not being around for either of the Gulf Wars but having served in the Middle and Far East when we had Overseas Tours it was always the slim fit ones that started to suffer with heat exhaustion first. Lets see how the PTIs cope with jacking up a Vulcan or Victor for a wheel change at Dubai at midday. On a detachment all mucked in including the overwieght unfit SNCOs(Sorry you dont have such big aircraft nowadays) Try them on a Herc in the desert