Jim Fixx
Jim Fixx had genetic heart issues, his father died in his early 40s from a heart attack, and the whole reason he took up jogging was to try and overcome his inherited heart problems, it did not work out so well.
(snicker) - lots of folks here will have to look up that name to understand that ...
Jim Fixx was 52 years old.
Keeled over at age 52...... I remember him as saying he would eat anything he liked and burn it up running/ (not AI generated__)
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Fixx was a member of the high-IQ club, Mensa,[3] and published three collections of puzzles: Games for the Super-Intelligent, More Games for the Super-Intelligent, and Solve It! The back flap of his first book says: “... He spent his time running on the roads and trails near his home, training for the Boston Marathon.”
Fixx started running in 1967 at age 35. He weighed 214 pounds (97 kg) and smoked two packs of cigarettes per day. Ten years later, when his book, The Complete Book of Running (which spent 11 weeks at number one on The New York Times Best Seller list) was published, he was 60 pounds (27 kg) lighter and smoke-free. In his books and on television talk shows, he extolled the benefits of physical exercise and how it considerably increased the average life expectancy.