A recent report showed that running as few as five minutes a day can bear significant health benefits.
But why stop at five? Where once marathons seemed long at 26+ miles, now there are ultra-marathons that go 50 and even 100 miles.
That's got to have some impacts on the heart.
Dr. Brian Morrison at Southern Oregon Cardiology knows a thing or two about hearts.
He visits to talk about the heart of an endurance athlete.