For training this past weekend I climbed to the top of Flat Iron in the Superstition Mountains east of Phoenix. There is slightly more than a 3,000 foot elevation gain to the top, so with a purposefully heavy pack it was a good summit day simulation--or it would have been if I'd been breathing through a narrow straw and only one lung was functioning. I imagine that's what it will feel like to breathe on the summit ridge of Everest at 29,000 feet.
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