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Fitness
Black Toenails and Snot Crust: Long Distance Running Explained
October 19, 2026
Coach Layn discusses why runners get black toenails, what the research says about shoe fit, swelling feet, and downhills, and the three habits that keep your nails. Then the snot crust: why cold air and cardio make the nose run, how it ties back to salt, and how to send a snot rocket without hitting the runner behind you.
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