As a trail runner and mental trainer, Sandra Mastropietro knows very well about the positive effects of sport on body and mind and is happy about all the new (running) athletes that the corona crisis brings forth. Her observation, however: The rules of etiquette seem to fall by the wayside more and more in the growing community. For the ISPO blogger this is the occasion to call for outdoor etiquette in part 5 of her series at ISPO.com.