Has anyone experienced this problem? I cannot walk far a few blocks, due to the pain/stiffness and muscle spams starting at my neck to my calfs. However, I can sit and drive with just some neck pain. Today, out of frustration, I took out my bike and rode for quite awhile. Again, the pain was only bothersome in my neck ares while I was riding. Can't figure out why there is such a difference when I try to stand and walk. Any feedback would be great. Thank you.