More than half of all runners will overdo it at least once in their running career.
A recent study by Samuele Marcora suggests this might be the case.
Recovery runs actually don't help you recover-but they're still worth doing.
The world's only "athletic illness" remains poorly understood.
And could they be the next big thing in endurance sports?
Stanford Medical School student, triathlon team member and Impala Racing Team member, Kierann Smith, was on pace to race her best race ever
Two new studies demonstrate that much-maligned lactate is benign at worst and beneficial at best.