Thanks to all of you for your comments and PMs. I know this is more complicated than I originally thought. First, I do have some flexibility issues from sitting at a desk for decades and not riding, second, I do have some L5 problems from a back injury 5 years ago that left parts of the left leg numb, and finally I have very short legs and a long torso so I tend to scoot my seat back or instinctively scoot myself to the back edge of my seat. The kinesio tape one of you mentioned might be a good idea while it heals, but I don't think my L5 problem can be "solved" and I ride two different bikes so I need to try to figure out which one might be aggravating it more and see if changes should be made. I also think my left leg is a bit shorter than the right, but I think both bikes are ok on seat height as that has been checked and triple-checked by people who are qualified. Sounds like I better go to PT and get as much advice as possible to deal with these issues and do a proper recovery before it causes more problems. Do any of you think riding in cold weather could make it worse? I notice that 37-38 degrees the back of my legs get cold, even with 2 layers on. That might make it stiff?