I read it as: Some of the guys you see associated with such courses are massive body-builders in camo fatigue pants/tight black tee shirts. They are massively built, but they are also often claiming to be soldiers. ...and soldiers need to be able to run up hills- in order to get places, and avoid the whole 'death' thing.
....I think it ties back to his statement about "paramilitary wannabe wankers".
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