Not all portraits are shot with the subject sitting in a chair, posed and ready for the picture. Sometimes you might want to get an action shot that says something about the person, similar to an environmental portrait. Children, especially, just like to move. Why fight it? Set up an action portrait instead.
For the photo in Figure 6.12, I used the Portrait picture control and set my camera to Shutter Priority mode. I knew that there would be a good deal of movement involved, and I wanted to make sure that I had a fairly high shutter speed to freeze the action, so I set it to 1/320 of a second. I set the focus mode to AF-C, the drive mode to Continuous, and just let it rip. There were quite a few throwaway shots, but I was able to capture one that conveyed the energy and action.