A bit off-topic, but the only concussion I've given myself was from tripping and falling while trail running. So there's that.
-- gnat! ("Weren't you wearing a helmet?" "I was running.")
My favorite quote about trail running (which I, too, do) is: "There are two kinds of trail runners. Those who have fallen, and those who will." I'm in the former group. :p
As for the OP, I'm not her and I don't know her situation so I have no opinion on BF.