Quote: " "Jim" Fixx (April 23, 1932 – July 20, 1984) was the author of the 1977 best-selling book, The Complete Book of Running. He is credited with helping start America's fitness revolution, popularizing the sport of running and demonstrating the health benefits of regular jogging. Fixx died in 1984 at the age of 52."
http://en.wikipedia.org/wiki/Jim_Fixx
Quote: " "Jim" Fixx (April 23, 1932 – July 20, 1984) was the author of the 1977 best-selling book, The Complete Book of Running. He is credited with helping start America's fitness revolution, popularizing the sport of running and demonstrating the health benefits of regular jogging. Fixx died in 1984 at the age of 52."
Heart attack.