Hi Jerry
jonathan would be a good person to answer this. I'll be watching this space with some interest. Anyway, here's some of what i know about it.
The vertical movement in slow waltz is the greatest. Each slow waltz beat lasts 2/3 second, and since the rise (in, say, a natural turn) lasts from end of step 1 to the beginning of step 3, you have the most part of 1 second to complete it. (but, interestingly, only about half that time to lower). In foxtrot, each beat lasts half a second, and the rise occurs over just one of these, and so is more abrupt, and less pronounced. Slow waltz is meant to be an undulating dance, whereas foxtrot is smooth, continuous flowing around the floor.
Jerry, i'm sure you know what foot and leg rise is really, however, try this - stand with your feet flat on the floor, bend your knees, and then straighten them slightly. That's leg rise with no foot rise.
Now straighten your legs, and go up on your toes. That's foot rise with no leg rise. Real rise is a combination of both, but it's important when rising up on to the ball of the foot, or even the toes, NOT to straighten your legs completely by locking them as this 'hardens'the action. (i asked a question myself about this a little while ago).
When you see a dancer in a photo right up on his toes, this probably isn't a static position. What i mean is, he is only momentarily in this position. Dancing is a dynamic activity and linear energy of movement is constantly being converted into height (potential energy) and back again. If you have good body flight and then halt it, you can go up high on the toes. the trick is to control this perfectly of course.
OK - now a question of my own which i hope someone more knowledgeable than me will answer. Body rise... exactly what is this?
An experiment - i sit on a chair, and keep my upper body in a good dance frame position. How do i get body rise? i can't rise at all (nor indeed lower, without losing good posture). So is body rise just another name for leg rise?
You'll notice i've said nothing about quickstep. !!