At the beginning of my twitching, I felt weak all over; it seemed that one week I was doing pilates and nothing, the next week, my legs and body were shaky holding the positions. From what I have read this is PRETTY COMMON FOR BFS . . . I stopped doing pilates and reverted to my favorite sport of running and also strength tests like push ups and all the other A word tests I could think of, or come up with on the internet, like walking down stairs backwards, pizza box hold, getting up off the floor wo use of arms, grip tests, etc. and have never had difficulty w/ any of them . . . yet, amen.