The principle of reversibility says your body adjusts to lower levels of physical activity in the same way it adjusts to higher levels.

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The principle of reversibility, also known as the use it or lose it principle, states that the adaptations made by the body to physical activity (both positive and negative) are reversible when physical activity levels are reduced or ceased. This applies to both increases and decreases in physical activity levels.

The Principle of Reversibility Says Your Body Adjusts to Lower