The Body Weight in the Preparation
The body weight should be on the back foot
The Body Rotation in the Point of Contact
Your stomace should be pointing towards the net in the point of contact
The end of the preparation:
You should be able to see the watch on the raquet hands wrist (If right-handed imagine a watch on the wrist of the right hand)
The free arm in the preparation:
Keep the free arm parallell to the baseline and the non-dominant hand on the heart of the raquet in the preparation
Preparation:
Keep the non-dominant hand on the heart of the raquet when you take the raquet back
The raquet should be pointing upwards, forward