Neck Rolls
With the Neck Roll, you're drawing half circles with your chin.
Start by doing the Forward Neck Stretch (above) to put you into your starting position.
Then roll your head to the side, so that you end up with your ear near your shoulder, just like in the Neck Side Stretch.
Hold it there for 1 - 6 breaths, the same way you did with the Neck Side Stretch.
Keys
The rolling motion is done by rolling your jaw along your chest, (or as close to that as you can manage). So the bottom of your jaw is drawing the semi-circle.
Another key is that you keep your eyes and nose pointing forward the entire time.
Next
Roll to the front again, by reversing your movements.
Pause there, for 1 - 6 breaths, holding it just as you did the Forward Neck Stretch.
Then roll to the other side.
Continue going back and forth as much as you like
Safety Tip Don't roll your head to the back. Just back and forth from one side, to the front, to the other side to the front again.