April 6th was World Physical Activity Day—did you miss it? Probably good news. Best to keep doctors out of it. Let me explain: I believe passionately in the benefits of physical activity, have researched it, published, editorialised, practised, and promoted it at every opportunity. The benefits of physical activity are undisputed and physical activity is to be encouraged, supported and facilitated where ever possible. But I am not sure that doctors have a central role.