I think Martin spends very little time training for CNF so his technique is not as polished as Will's. Martin probably just relies on his huge dive fitness. I can do good DNF distances despite the fact that my technique is rubbish, simply because of the dynamic training I do.
Incidentally, waterline length is not a factor underwater becase... there is no waterline. Arms-up is more efficient because it makes your profile more streamlined, but that's different from what they're talking about in that article.
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