I'm curious as to any other BFS sufferers experience problems with running. 5 years ago I could easily run a mile in under 10 minutes, but now as I try to push myself through various aerobic exercises such as running I notice significant differences. For example, now when I run I cannot run for very far before my ankles begin to hurt with rather extreme pain, and when I attempt to sprint for a short distance I am about twice as slow as I was 1 year ago. Now my time for 1 mile is a hideous 13 mins, and my 100 meter sprint is about 28 seconds.... When running I get the sensation that I am not able lift my legs as high and keep a large stride like I used too, but I am not sure whether this is due to stiffness, weakness or perhaps both.I've had an EMG that came back with only fasciculations, and was told I do not have ALS by a an ALS specialist. But regardless these problems with running/brisk walking have me worried. I'm not overweight and have only put on a few pounds since I was last able to run/sprint quickly (before the BFS-like symptoms).Have any of you experienced considerable changes in your ability to run or walk very briskly since you started having BFS symptoms?