Forehand and backhand push

Master Rosario,...

When I play forehand and backhand push , I have to use my wrist in the moment of the contact or not always?

Sometimes only arm and forearm? 

Thank you in advance.

Hi Il,

When you are starting it is best to not use your wrist for the push.  As you develop you can start to use the wrist more.  It is like most strokes as you develop you can use more parts of the body.  Initially it is good to keep it as simple as possible.