Just search flip turn on youtube. I didn't find one without legs out at the top of the flip. In the swiming I watch, if the legs don't come out, the kid has gone too deep and is going to lose time on the turn. but it happens and they still get round. but all the olympic swimmers have a leg pop moment, so you're in good company
My coaching task for tomorrow: teaching my new flippers how to remember not to flip on the breaststroke
