Rob,Wow! I read your post on Saturday, but haven't had a chance to respond until now. My story is very similar to yours, without the running... I do think it had to do with sitting at a desk though.I am 25 and work a desk job in Queens. Right after getting diagnosed with Celiac Disease, one of my very first BFS symptoms (along with perceived weakness in my hands), was a weird feeling in my left leg. My left calf felt tight and both thighs constantly felt like they were being tensed up while I sat at my desk. Thighs then started twitching sporadically (mostly hit and run, one pop twitches). I got myself to a neurologist and had a clean EMG on my legs and butt, as well as a clean neuro exam. That was in April of '09. I am still dealing with twitches and the anxiety that comes with it, DESPITE the clean tests. I am in the process of dealing with the real issue right now, which of course is anxiety. My neuro told me to get the anxiety under control the moment he said, "What you're having are called benign fasciculations." Since that appointment, my twitching has popped up in various parts of my body including: both shoulders, butt, both biceps, both arms above elbow, both thighs, back of neck, lips, chin, eyelids, arches of both feet, calves (occasionally) and more.The truth is that I KNOW that this is all benign. But being the hypochondriac that I am, knowing that I'm fine isn't the problem. Worrying that I won't be tomorrow, is. It's amazing when you go to doctors with these issues, and they basically can LOOK at you and say you are fine. I'm going on 15 months on this road, and still can do everything I did when it all started. Going to a doctor, squeezing his fingers and him looking at you and saying "you're fine" always helps.Hang in there, keep exercising as much as you feel you can, and stick with us... this board has been a blessing for me, and continues to be a place I come for reassurance and help with my own anxiety.-AntP.S. Maybe it has something to do with us being in NYC... crazy places lead to twitching. Ha!