Bringing your back foot up after you hit the tennis ball puts you in position to recover back to the middle of the tennis court. The key, as we explain in this video, is to get your body facing the net after you hit (similar to the ready position). This will let you side shuffle back to the middle of the tennis court.
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This video falls under tennis footwork.
Footwork is arguable the most important part of the game. Moving to the ball and recovering after each shot correctly is absolutely critical — great forehand or backhand technique means nothing if you can't get to the ball. Great footwork is a skill shared by all of the top pros on tour.