In the relentless pursuit of athletic advantage, a surprisingly simple method is gaining prominence among elite competitors and everyday fitness enthusiasts alike: breathing, or more specifically, not ...

If you want to toughen up, you could take extreme measures, such as sitting in an ice bath or sauna for increasingly long times. Or you could just go for a run, suggests new Australian research.

Earlier this year, I went for the kind of morning run where the sun beats down on your back the entire way. Every step was an effort, and even the air felt thick to breathe. By the time I got to the ...

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