Last week while I was doing leg curls I was a bit distracted so I didn't really control the negative as much as I really should have (read: barely at all) and I started getting some pain in the medial section of the back of my knee. After the third set I couldn't do any more since it had grown sharper. For the next few days it hurt a bit (3-4 on a scale of 10) but it faded.
Fast forward to today when I was doing leg curls again. I was doing controlled negatives and rotated my leg a bit in a few directions to see if I could get some relief, but the pain came back and wouldn't leave while I was doing them. Like last week I stopped after the third set.
Now for the questions. First, what's causing the pain? I think it's the tendon of my semitendinosus/semimembranosus, but I'm not sure. Second, do you have any suggestions for what to do? I'm obviously going to be taking a month or so off from doing any leg curls to ensure that it fully heals, but I just wanted to be sure that there isn't anything more I should do.