Many questions come to mind concerning running and runners and public health.Here are a few.1. Why do runners live an estimated 2 to 2.5 years longer than non-runners?2. Why are runners rarely overweight?3. Among runners do they have the same incidence of the following problems compared to non-runners that so far the causes of which are basically unknown? Muscular dystrophy multiple sclerosis Parkinson's disease amelanotic lateral sclerosis and Alzheimer's disease?4. Why do women runners have so