I always think of Pete Maravich:
Maravich had flown out from his home in Louisiana to tape a segment for Dobson’s radio show that aired later that day. Dobson has said that Maravich’s last words, less than a minute before he died, were “I feel great. I just feel great.” An autopsy revealed the cause of death to be a rare congenital defect; he had been born with a missing left coronary artery, a vessel that supplies blood to the muscle fibers of the heart. His right coronary artery was grossly enlarged and had been compensating for the defect.
They say that it was a miracle he lived as long as he did.
When I think of running, I think of Jim Fixx https://en.wikipedia.org/wiki/Jim_Fixx