I respectfully disagree with the belief that it doesn't matter whether your breath in from your nose or mouth.

MT's tip for climbing is a technique for a particular circumstance.
Unless you have a nasal problem, you should try and breath in thru nose/exhale thru mouth in the majority of times when your exercising strenuously/

I'm sure other than Mt's climbing technique and maybe some Martial Arts disciplines where you want the deep mouth breath, but there the exception, no the rule.

I'll give this link as too why I believe as I do. Google the subject and you'll find other resources as well. I think this GUY knows something about breathing under strenuous exercise, arguably the best aerobic conditioned athlete in history.

The comments about utilizing the diaphragm, are still valid.

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