Pulled my left arm while fencing. Not even sure how.
Probably over extending your arm, or not warming up enough.
You can pull a muscle doing anything. You can pull your muscles while you sleep.
I've not pulled any muscles to an extent of serious pain for sometime. Probably a few little pulls in recent months, but nothing serious.
My older brother however keeps pulling his arm and leg muscles, mainly because he's started going back to the gym after having not been for some time.
