The race, which is run totally on beach sand, is so unusual and different from others that the Caja Costarricense de Seguro Social issued a special bulletin.
The Caja wants racers to prepare themselves for the run in the coastal sun by drinking lots of fluids before and after. The Caja suggests at least eight glasses of water before and after. Plus it urges participants to chow down on fresh, juicy fruit.
The start is at 4 p.m., which provides a little relief from the blazing sun. The course is along nearly the entire south side of the Puntarenas Centro peninsula. And those participating should not forget the sun block, the Caja notes.