Injury is the most common reason for runners retiring from the sport, especially as far too many attempt to run through pain without thought for the consequences. Chronic injuries that is, long-standing ones are invariably more difficult
therapist and biomechanist Irene Davis from the University of Delaware's Running Injury Clinic. "Your threshold could be at 10 miles a week, or 100, but once you exceed it, you get injured." Various studies have identified injury thresholds at 11, 25, and 40