exascot - I think the answer to your question depends entirely on what level of fitness you maintained when you were in. If, as your nom-de-pprune suggests, you are an ex-truckie used to eating your own body weight 3 times a day (gear up, flaps up, breakfast up etc etc) then not much effort required
Actually, not guilty. I have always eaten like a sparrow but unfortunately drink like a fish. Always run wherever I am in the world. Got chased by a pack of dogs in Botswana last month! I bet that I can still get into my mess kit which was never altered since OCTU.