Most of my running friends had painful knees until I told them to stop heel striking so bad and over stride, they had minor calf pain for two weeks and never co

Most of my running friends had painful knees until I told them to stop heel striking so bad and over stride, they had minor calf pain for two weeks and never complained again. I have no data but I think most people simply don't know how to run, urbanites will spend $600 on carbon shoes and run like absolute clowns wondering why their fancy shoes don't prevent injuries... run barefoot in a field and you'll get your natural running gait