2nd Day Soreness is when the body experiences increased levels of "lactic acid" in their musculature. This lactic acid is a direct result from the microscopic tearing in the muscle fibers when they contract when working out.
Lactic-acid accumulation, commonly thought to contribute to muscle fatigue, actually helps restore force to weakened muscles. “By altering the activity of chloride ion channels, lactic acid may actually boost the generation of action potentials and, hence, muscle activity even as the muscles begin to fatigue,” reported Science.
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