Exercise-associated collapse (EAC) was developed as a marathon collapse classification matrix to speed clinical decision making and improve care. The definition was simply stated as the need for assistance during or immediately after endurance activity that specifically excluded cardiac arrest, insulin shock, anaphylaxis, trauma, skin conditions and orthopedic injuries. The presenting symptoms were neither specific nor sensitive and the initial classification, based on presenting rectal temperature, neurological status and ability to walk, was intended to shape the on-site medical intervention. The treatment of EAC centres on fluid redistribution and replacement to improve cerebral and core organ circulation and body temperature correction if needed. Most runners are discharged from the medical area in the company of another person.