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Most people think muscle failure is a hard physical wall—that when the bar stops moving, your fibres are literally out of juice. It’s a clean, reassuring theory, but biology tells a different story. Long before your muscles reach true mechanical failure, your brain pulls the emergency brake. It triggers a spike in perceived exertion, floods your awareness with burning discomfort, and convinces you that you've hit your limit. It isn't a physical collapse; it's a software overr