“Alpinism is unpredictable and draws on all aspects of your body and mind,” says O’Neill, who summited both Everest and Lhotse within 24 hours in 2012 and has pioneered dozens of first ski descents on mountains around the world. So her training regimen can’t be too regimented. The Telluride, Colorado, resident keeps fit by mountain biking, trail running, ski mountaineering, and doing yoga. To learn to adapt in the mountains, O’Neill constantly adds things to her repertoire that she isn’t experienced in, like triathlons and ultramarathons. “I find it more intriguing and fun,” she says. “I also think it’s better for overall fitness.”
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