Some athletes go to the gym. Some run long distances across vast terrains. Some even build their fitness using brine and seafoam. But many Olympic hopefuls, such as those competing in this year's Games, sometimes schlep to more than 10,000 feet, where just breathing can, to the underconditioned, feel like a workout.
Source: https://medicalxpress.com/news/2026-02- ... itude.html
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