> I've seen many people around me with knee replacements Caused by running too much ? Every sport is detrimental at _very high_ level but I think you have a f

> I've seen many people around me with knee replacements Caused by running too much ? Every sport is detrimental at _very high_ level but I think you have a faaaat margin before running becomes an issue, most people are much closer to "undertraining" than "overtraining" If you learn to run without heel striking (I don't even know how people can run like that but I see it all the time, no wonder it hurts your knees) and don't run on hard surfaces you can run a marathon a week and I doubt you'd ever develop any issues https://www.health.harvard.edu/healthbeat/will-continuing-to-run-make-my-knees-wear-out-faster https://www.health.harvard.edu/healthbeat/will-continuing-to...