Well those actions are ok for the beginner to visualize something, but when you got trained you don't use them as said in NEW anymore. It's just to get a start on specific aera, but aftet that you can use either of them on any zone of your body. Just do as it feels the most natural for you and it'll work.
If an experienced NEW user could draw pictures of all the areas in roberts training guide and show where the secondary centers are and show all the actions done.
Stirring:A circling arrow going around the specified secondary center.
Brushing:An up and down arrow on the specified secondary center.
Tearing:2 arrows pointing opposite ways on the specified secondary center.
Wrapping:Maybe a spiral arrow on the specified secondary center.
Sponging:Maybe a really wide/bold arrow going up.