Pardon my laziness, but this should suffice as a starting point. https://www.webmd.com/fitness-exercise/news/20140401/too-much-running-tied-to-shorter-lifespan-

Pardon my laziness, but this should suffice as a starting point. https://www.webmd.com/fitness-exercise/news/20140401/too-much-running-tied-to-shorter-lifespan-studies-find https://www.webmd.com/fitness-exercise/news/20140401/too-muc...