Yeah my doctor told me not to run anymore because most runners get runner's knee. Why do runners get runner's knee? Well because their technique is wrong, they don't have adequate strength to support their knee joint. Why do runners have poor technique and inadequate strength? Well because....And if i kept on asking why, the doctor would eventually say something about statistical evidence this and statistical evidence that without addressing any specific remedy to the problem. Well then, instead of telling runners they would get injured by running, shouldn't they instead encourage them to find ways to prevent injuries and perhaps enhance the experience of running?