Over the past few weeks, I have noticed that my left leg seems to fatigue at an abnormal rate when I run, while my right leg feels completely normal. The difference is particularly noticeable when I run uphill. My left quad will be burning with the effort, while my right leg feels totally fine. My left leg is not weaker, if anything it's my stronger more dominant leg. I'm thinking this must have something to do with the way I'm running, but I can't figure out how to correct it.