It is this build up of lactic acid that causes the pain, heaviness, feeling of exhaustion, deadened muscles, and 'muscles will not work or go any faster' sensation. I am also interested in this idea because in horses there is a condition known as azoturia (tying up), which does not have an obvious human parallel.
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Mic Drop and Drop the Mic are expressions referring to the practice of intentionally letting a microphone fall to the ground as a display of bold confidence following a successful performance. Colloquially, the expressions have also been used to celebrate the delivery of an impressive argument or insult.