Published: 18 Mar 2019 › Updated: 18 Mar 2019
ActFity
Fatigue is caused by your cells struggling to keep up waste disposal. Lactic acid – which builds up when your cells inefficiently break down glucose – doesn’t directly make your muscles sore. But it does increase acidity inside cells and they don’t work as well.
Or another bad feeling that your legs are on fire? That’s your brain telling you to slow down.
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