Tennis = WSC
Tennis should be an equal combination of
W - What you Want to do
S - What you Should do
C - What you Can do
What you want, should and can do will have a profound effect on you playing style and preferred footwork selection and contact moves.
Simply put:
What you want to do relates to - tennis playing personality
What you should do relates to - smart shot selection
What you can do relates to - what feels comfortable and works for you