Some actors are just actors, whereas some actors are also competent martial artists.
It is easy to tell them apart.
The actors are slow and clumsy whereas the martial artists look casual and confident.
In order to perform any martial art skilfully, considerable ongoing training is necessary.
If somebody on-screen makes it look easy, allow for the fact that they have probably invested a lot of time practicing the movements and rehearsing the scene.
No matter what level of skill is being shown, it is still pretend.
