Cells store exercise memory

Muscle and liver cells record prior training at the cellular level so that when you retrain after a break you regain strength, endurance and metabolic benefits faster than a never‑trained person. Mouse ON–OFF–ON protocols and some human data show retrained tissues grow bigger/faster and match energy supply to demand more efficiently even after detraining. — If true and generalizable, this changes how clinicians and public‑health officials should frame exercise recommendations for people with intermittent training (injury, childbirth, work) and affects diabetes, obesity and rehabilitation strategies.