'Muscle Memory' May Not Really Exist

Muscle tissue does not have a "memory" of past exercise training, new research suggests. That may be both good news and bad news for people, said study co-author Malene Lindholm, a molecular exercise physiologist at the Karolinska Institute in Stockholm. "It's encouraging for people who haven't trained when they're young because you don't have a disadvantage," Lindholm told Live Science.