Over the past month or so when I'm running it feels like a tendon in the back of my left knee is going to pop. I don't feel it when I'm walking or jogging, only when I'm running and trying to kick it into a faster gear. When I try and get into a faster pace I can feel myself start to naturally favor my right side and I have one side doing this short little choppy stride and the other trying to talk a longer stride. When I start to feel this there isn't any pain, just a weird discomfort feeling. it's really starting to discourage me cause I'm finally getting to the point where I know I can go a lot faster for longer distances, but my flippin' leg won't let me. I really don't want to have to ease off, before I even get going. I'm trying to make an appointment for this week with a doctor, but I thought in the mean time I could get some opinions from you guys.

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