Your cells keep a record of every workout you’ve ever done – and those gains persist even after a break from exercise

Exercise physiologists studying mice found that muscle and liver cells retain a form of memory from prior training, helping animals regain fitness faster on a second attempt even after a period of inactivity. Retrained mice grew bigger muscles and muscle fibers than mice with no training history, and their livers released more fat-processing enzymes that feed working muscle more efficiently.

The effect appeared to persist even when mice ate a high-fat diet, and some benefits may even pass to offspring, as mice born to exercised parents showed better blood sugar control and less weight gain for a year after birth. The researchers frame this as evidence against a strict use-it-or-lose-it model, joining other findings that skin and fat cells also retain records of past states like inflammation or obesity.

The authors are careful to note this isn't license to skip workouts, since nothing in the data suggests past training substitutes for present training.

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