A foot fault occurs when a player's feet are at rest before hitting the ball, but they are moved before the shot so that a foot hits one of the following positions:
- the court, including the baseline
- any part of the imaginary extension of the outer mark
- anywhere beyond the imaginary extension found outside of the singles guideline or the doubles guideline, depending on the match type.
To avoid being called for a foot foul, you should ensure that your server is relaxed and stationary. This means that you should avoid any type of serve that involves more than one foot's movement to avoid being called for the foul.
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