This is pretty much bunk. https://trainright.com/is-ultrarunning-bad-for-long-term-health/ https://trainright.com/is-ultrarunning-bad-for-long-term-hea... You

This is pretty much bunk. https://trainright.com/is-ultrarunning-bad-for-long-term-health/ https://trainright.com/is-ultrarunning-bad-for-long-term-hea... You can have serious acute injuries from running via physical accidents or mismanagement of hydration. You can also die driving to the market to buy toilet paper, but the risks in both cases are extremely manageable. Life threatening or debilitating chronic health problems from running high volume are rare, and far outweighed by the overall health benefits of regular exercise. Most of the ideas that persist out there, like running being bad for your joints, are complete myths. 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... The only thing to get screened for if you want to run marathons or more is a family history of heart defects, to avoid the very small possibility of sudden cardiac death, which is a risk with basically all intense exercise, including things like shoveling snow or other manual labor. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6070620/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6070620/