Here is another way to look at it. Instead of thinking about pulling up and down, think of pulling back and forth and around. Your feet/legs naturally pedal down and up, but try and picture them going around in the middle part of the circle, the horizontal plane. IDK......... it helps my pedal stroke immensely to picture it this way. HTH!
Annie
Time is a companion that goes with us on a journey. It reminds us to cherish each moment, because it will never come again. What we leave behind is not as important as how we have lived." Captain Jean Luc Picard