I was previously at a place in my life where I compulsively did endurance exercise (including 3 marathons) to keep myself fatigued and numb my feelings. It was not too different to how some people smoke weed or drink, except that everyone in my life thought it was great and healthy. I spent a long time not making some very hard but positive life choices, and now my stomach lining is shot from pounding NSAIDs to keep exercising through joint pain.