Muscle cells strengthen in response to intense exercise - whether you're 18 or 88. But the intensity is what's lacking in most people's workouts. And there are doctors who'll give you the advice, "Well, don't push it."
Jack LaLanneWe don't know all the answers. If we knew all the answers we'd be bored, wouldn't we? We keep looking, searching, trying to get more knowledge.
Jack LaLanneI do it as a therapy. I do it as something to keep me alive. We all need a little discipline. Exercise is my discipline.
Jack LaLanne