Hi Matt, I've been have a problem with I think my hamstring at the back of my knee. When running a couple of months ago I felt to tendon(?) at the back of my knee becoming uncomfortable. I stopped running for a couple of weeks, but it never felt 100%. I've run two half marathons since with no problem but still not perfect. Last week on a training jog I felt the tendon(?) again start to become unconforable so I stopped my run. I've not done anything for the last week and I can still feel its not right and I can even feel it when driving (a stinging feeling). I am sure I could run on it but would like it to clear up 100% this time. Would you have any advise.