have no idea about it, but there are tons of stories here starting with: "I alsway was a sportsmen, had a marathon once a week, push up tons of iron, did few cardios a week and all the rest i was swimming, and it ended up with BFS".I mean looks like significant physical loads provoke twitching as well as no workouts at all too. Morevover, BFS causes excercise intolerance, so many of fellows report they have more benefits from stretcing excercise, yoga and other non-focreful physical activity.