When you move around on the stage, make sure you feel comfortable with your movements and posture.
Move on stage according to the available space.
The physical space in which you give your talk may be quite limited, so you should restrict your movement to changes of posture, hand and head movement.
And please, don’t rock from side to side!
If there is enough space, use it to move or change position during the talk.
In this case if you pause, take a couple of steps and then start speaking again.
Or, if you want to stress the importance of what you are saying, move slightly closer to the audience and build a closer physical bond with them. They will definitely pay you even more attention.