There’s a reason elite runners flock to towns such as Park City, Utah (altitude 6,936 feet above sea level), Flagstaff, Arizona (6,821 feet above sea level), and Mammoth Lakes (7,881 feet above sea ...

It seems like a simple-enough concept: Train where there’s less oxygen, force your body to adapt, and come back down to low altitude to race fitter and faster. Indeed, the allure of altitude training ...

Most men hit the gym to build muscle, drop a few pounds, or sculpt a six-pack. Nothing wrong with that—until you’re on a mountain. Mother Nature doesn’t care about your physique. The only thing you ...