Howsit,
I’ve had some issues with my knees recently, particularly ITBS and tendonitis. In the last week I noticed on my left foot stride I was not landing where I thought I was – I.e. on the midfoot. I was in fact landing almost flat footed, only on the left foot. This discovery has led me to consciously alter my gait to landing more foreword (and symmetrically with my right foot) while running.
Point I’m trying to make is there may be a really small imbalance that goes unnoticed in the smaller runs but when accumulating miles these asymmetries can become real issues.
Cheers’
Luke