Exactly. No amount of physical activity, regardless of how time efficient it would be, does any good if people don't do it. By making it enjoyable (e.g. walki

Exactly. No amount of physical activity, regardless of how time efficient it would be, does any good if people don't do it. By making it enjoyable (e.g. walking with a dog), that makes it more likely one is going to do the activity. It doesn't matter if you can get the benefits of 2.5 hours of walking by doing 15-30 minutes of HIIT if one simply doesn't like HIIT.