Sufficiency
I spent most of last week in and around Park City, Utah on a family vacation. I usually run in Portland, Oregon, where the elevation is about 230 feet (70 meters) above sea level. In Park City, the elevation is about 7000 feet (2134 meters) above sea level.
Among other things, the altitude adjustment makes for one tired runner. I felt like I had picked up a pack-a-day smoking habit just before setting out to run a 10k.
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