I like that the study reviewed above focuses on "activity" not specific exercises. It really highlights the importance of any daily activity. I like to run around the house with my dogs, but I don't know that on a survey I would consider that as "exercise".
We're hoping to be active with our nieces this weekend! It is going to to be a beautiful day for a walk to the park. The only downside - I might have to carry Aro there (if he had surgery on both knees - no news yet from the vet).