We had a guy on my Team once. Very pretty dude, nice tan - poster child in fact. Ran like a striped-assed gazelle in fag shorts and PF Flyers. Run for miles.
Then one day, the mission called for a sprint from Point A to Point B in kit. Bad planning, but it happens. About 1500 in a tropical environment. 100 pounds of HSLD Lightweight kit. He started first, but was the last to arrive. I even passed him (And slammed into him with a shoulder to let him know it was me
). And he couldn't do anything when he did arrive.
Functional strength is the key. Not asthetic or any other type. If I was a TS looking at the Box, I think I would be concetrating on training my team to run 100 yards in full kit as opposed to 5 miles in shorts. Climbing low and high walls in full kit instead of gym biceps. Things like that.
But I could be wrong - it has happened.