PreventionUse body weight, time, and sweat rateStart sessions hydrated instead of trying to rescue it mid-race.Match hourly drinking to sweat loss, not fear.
Emergency signsHeadache, swelling, confusion, vomitingThese can look like heat illness but need rapid medical attention. Use the referral chain inside a school for who to tell, and in what order.Stop pushing fluids if symptoms worsen after drinking.