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I've done some high altitude training and living. In fact, I just got back from a week of training at 6800 feet. I'm back at sea level now, and I can tell a huge difference and have every time I've done it. Scrambling up and down mountains is awesome for your cardio too. In addition to this, I've also done gas mask runs semi-regularly in the past, and those make a huge difference even though it sucks balls to do them. It's sort of like breathing through a straw, so every step and breath becomes exponentially more difficult, but the results are worth it.
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"Strong people are harder to kill than weak people, and more useful in general."
-Mark Rippetoe
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