So 8 days ago, I noticed some knee pain. Its hard to call it pain; discomfort and instability and some decreased range of motion. I think its from wearing heavy boots for a few days in a row. I ran 6 days ago, fine, no problems, but decided to take a week off for the heck of it. Yesterday I did some leg extensions and leg curls, and my right quad felt like it was weak. I think I had some knee pain from the boots and some weakness in the quads (go figure). Tomorrow I'm gonna do a 20 minute run and see how it goes. I guess the week I took off wasn't too bad. I guess its always good to let the body repair every now and then. You never know whats going on inside those leg and foot bones until you've done too much.