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 ...

If your preferred form of cardiovascular exercise has grown far too easy for your impossibly fit self, perhaps you've considered supplementing your workout regimen with an elevation training mask.

Don’t get us wrong. Lifting weights and building muscle improve just about every marker of health you can think of, from bone density to injury resilience to overall work capacity. But gym fitness ...