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A friend of mine started preparing for his first half marathon last year. At the beginning, he only cared about finishing the race without stopping. But after a few weeks, he became curious about everything connected to running — pace charts, hydration advice, meal timing, recovery routines, and body weight.

That was also when he noticed something strange.

One running app showed his weight in pounds. A training article from Europe talked about kilograms. A YouTube coach discussed fuelling strategies using kg-based calculations, while another fitness website used lbs for everything.

At first it felt confusing, but

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