While much of Ellen Gallant's training has been physically active, it doesn't end when she goes to sleep. An altitude tent has covered her bed since October, where she routinely sleeps in a simulated low-oxygen environment around 18,000 feet. Gallant hopes to makethe summit of Mount Everest it in about seven, by her 51st birthday on May 16. (Ryan Dorgan/Jackson Hole News & Guide via AP)
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