That lovely period of time you spend lying in a muddy hole in the ground wondering what the f**k you are doing. Generally accompanied by a packet of soaking wet Benny Hedgehogs that are squashed flatter than a snail's wine cellar, along with the largest misnomer on exercise (namely - a cigarette lighter).
For reasons best known to themselves, a cigarette lighter taken on any "training" period will, inevitably, turn back into a piece of useless plastic with some flint attached. This forces the luckless soldier to resort to Wind-Proof non-flammable matches to light his Tabs. See also cigarette lighter.
See also Korean Knife Fighting Course.