Um, Jim Fix died of a heart attack.
Jim Fixx was a long distance runner. The benefits of running revert back to no exercise, by doing marathons. And it makes sense. Overdoing anything is bad. We learned that from the story of Goldilocks.
NFL players overdo exercise and their ankles are shot.
Schwartzenegger was the world’s winning bodybuilder who would be dead if not for a pig skin heart.
Overeat, you get fat.
Over videogame, you become socially handicapped, and blind.
Over play loud music, you get deaf.
How many folks have back problems, from over bending incorrectly.
Healthy running is about 2 miles or less.
5 miles is dangerous. Moderation is common sense.
But pushing your breathing to the heavy side, for a few moments, without overdoing it, is the key.
Your body wants that, badly. The whole body joins in.
Live long and prosper.