A study of this champion's heart helped prove the benefits of exercise
He trained more than was commonly believed humanly possible at the time. He ran lots of mileage. And the idea in the past was that lots of mileage would wear you out that you would die early.
The brain resorts to myelin when other brain nutrients are depleted
Marathon running induces reversible changes in brain myelin, which may impact energy metabolism and offer insights for treating demyelinating diseases.