For example, "walking more" or "cycling more" is definitely going to help lose weight in a gradual fashion, but the reason I am walking the amount I am and not cycling at all, is because a) I find these activities boring, and b) I have many more interesting/important (to me) things to do with that time. I can't see myself engaging in an activity I dislike - cycling (or most outdoor activities) - unless I do it for a reason that's interesting/important enough to displace something else I'm already doing. Losing weight is such a reason, but that reason is also a goal.