A player has a shot to work on, no pressure, and they wish to hit an aggressive forehand -
1) What foot positions are they likely to choose?
2) Like Djokovic's footwork above? [Djokovic has a bent arm forehand with Semi-Western? grip.]
3) What is the name for that Djokovic's stance?
4) If we observed many ATP & WTA players, what percent of each likely stance would we see?
For simplicity, just consider and observe forehands that don't change the direction of the ball's trajectory very much. Imagine two players choosing footwork for hitting heavier rally balls that don't go very wide. Minimize variables, no feet off the ground or inside-out forehands, etc.....
For a few first observations, I looked at the above video and estimated that a line between the feet was about 45 degrees to the ball trajectory or the forward direction of the court. I looked at a few other ATP and WTA players hitting forehands and they seemed to place their feet about like Djokovic's feet.
Looking at the Djokovic forehand, once his feet are placed, his pelvis (hips) can be moved by his legs over a certain angular range. The upper body, above the pelvis, also moves over a certain angular range (see 'separation'). See Djokovic video.
5) Is this ~ 45 degree angle of the feet widely used by many of the current forehand drives? Technique issues?
6) Does a 45 degrees angle foot placement give favorable ranges of motion to both the 'hip rotation' and the trunk twist?