to their normal lengths. Then when you start to exercise, your muscles stretch even more to about 10 per cent longer than their resting lengths. This means you have a 20 per cent change in muscle length from the time you get out of bed until your muscles are well

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

did a 1-2 mile jog cool down, but then I was stuck in a car for hours due to a breakdown so my knees were flexed for ages).This is supposed to be my last big training week before the three week taper. I took Monday and Tuesday off. I felt fine