Note that a variable may be both an XV and XS in a specific case. These scales are important and differ in important ways, but present little difficulty with respect to the immediate discussion.
Taller people weigh more h.
Note that the sequence could be reversed, but adds no additional variations. This, again, should not discourage you. You may be interested in more than one H, and you may want to actually do research on several H s with more than two variables, but you will find it easier to work on them one at a time, and then combine them.