Runners who take part in day-long "ultramarathons" experience much of their fluid loss in the first 8 hours of the race -pointing to the importance of staying hydrated early on, a study has found. Ultra-marathons last anywhere from 12 to 24 hours, and although runners can rest, eat and drink when they

Runners who take part in day-long “ultramarathons” experience much of their fluid loss in the first 8 hours of the race -pointing to the importance of staying hydrated early on, a study has found. Ultra-marathons last anywhere from 12 to 24 hours, and although runners can rest, eat and drink when they