Remember that the Main Character throughline is all about their personal issues and perspective on things. So what you’ll see with an MC in Activity is that their physical activities get them into trouble and they usually resort to those problematic activities as a way of trying to deal with their angst or issues. Often they might be shown sort of “not being able to help themselves” from getting into further trouble through activities, like Dr. Kimble in the Fugitive going around putting himself in danger instead of laying low.
Another example, in Home Alone (which has MC Activity if I have the storyform right in the other thread), Kevin lashes out and pushes Buzz because he feels he’s being mistreated. Later, he burns off the steam that’s been building up over years of mistreatment by doing all sorts of crazy activities in the house (tobogganing out the door, jumping on the bed with popcorn, watching big kid movies, etc.).
With Woody being a Change character, he’s a little different than Dr. Kimble and Kevin because they use their Activties to show/prove that they’re right, while Woody needs to learn to give up being the “most played with” toy, an activity that is so dear to his heart. The official analysis quote you mentioned might have been a bit more helpful if it explained how those activities he initiates are sort of in response to his angst about not being the “most played with toy” anymore.
Also see this: http://narrativefirst.com/articles/the-toy-story-dilemma, which argues that Woody is actually Steadfast. @actingpower that’s probably where you remembered that from (or you just sensed within your awesome dramatica enhanced memories)