The Exercise That Can Undo Years of Aging

Contrary to popular opinion, a recent Mayo Clinic study suggests that it’s never too late to rejuvenate aging muscles.  

Contrary to popular opinion, a recent Mayo Clinic study suggests that it’s never too late to rejuvenate aging muscles.  But not just any exercise will work.  The secret to rebuilding muscle mass lies in intense interval training.  The New York Times reports the details.