I was dancing with a friend recently. Dancing an 'old-time waltz' which is like a viennese waltz to a slower tempo (165 Beats per minute)
On her forward step (beat 1)into the natural turn she dropped suddenly by about 3 or 4 inches. It was very noticeable. 'Suddenly' means within about 1/3 of a beat.
Interestingly, on the reverse turns, this didn't happen at all. In fact the reverse turns were super, and we moved with good body flight.
Later, i watched her dancing with another guy to see if i could spot the reason for this. She was 'reaching' out with her right foot into the natural turn, and sitting a little. I think she had to sit a little to allow the foot to reach out. This stopped the smooth movement of her body. On the reverses, she took a noticeably shorter step (probably because the man is more 'in her path' on the reverses). And yet in spite of the shorter step, the body flight was better in every respect, as i'd discovered.
I learnt something that night. I learnt that good body flight isn't JUST about going for long steps. It's about controlling the body so that it moves through the standing foot. Then later maybe you can add the long steps. (I know...I know - i should have known this all along. But there's nothing like actually experiencing a problem and seeing the cause in front of you.
Remember what they say: "Tell me and i may forget, show me and i may remember, involve me and i will understand").