In backstroke you swim on you back the whole time. One of the he hardest thing about backstoke is trying not to run into the lane lines or hit your head on the wall, its actualy harder then it looks, mainly you should be looking up the whole time.The trick to not hitting your head is a trial and error sort of thing. Once you get to the flags you neeed to count how many strokes it taks you to get to the wall. It very simple, but takes pratice.