Reason Why Our Muscles Get Tired

There are only so much weight-lifting repetitions your arms can take before they start aching and can barely move at all, but why is that? Conventional wisdom says it’s because you’ve run out of energy, but it’s not quite as simple as that. Nor is lactic acid to blame, really. This short video explains exactly what happens in the muscle when you’re working out and the mechanism behind the pain you’re feeling.

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