I know this may sound rather simple of a question, but what is the proper footwork to back up during a rally? Say, for example, you're given a ball a little into the court from the middle. How should you properly back up if they return your ball with a deeper (more topspin, hits the line, etc.) ball back to the middle? I realized I just don't know what to do after I split step when I notice my hitting partner has given me a deeper ball straight back at me. I tend to just awkwardly stumble backwards.