Z serving for points can be an art form. Many players tend to have one Z serve.
Good-but how many have three or four different Z serves? Your opponent will get used to your Z serve eventually so you have to have more than one in your arsenal.
Here is a way to add some Z serves to your arsenal.
1. Start high and hit your z-serve lower into the wall.
2. Start low and hit your z high into the wall.
3. Now hit a medium Z serve and do not hit it hard, but let it roll off the racquet. That gives you three Z serves-high to low, low to high, and the roll Z.
4. Now take each of those serves and execute them with different ball drops, (Secret sauce alert!) Drop out (further away from normal drop), medium (in a little) and in (in more) and you will see slightly different trajectories each serve!
You are in business and with all three plus the endless variations! You can also sneak a drive serve to the opposite side of the court off the motion but be sure keep the same approach!!