HEY!! I'm a Peggy Fleming Fan- watched her on Tele when i was a young lad and have her web site saved in my 'favourites'.
The first posting in this thread is so way off the mark i can't believe it. And because Alex Moore didn't mention 'body flight' doesn't mean it doesn't exist.Alex Moore's book is not the bible, as i've said before.
Of course you can soften before the body arrives over the standing foot - it's essential. The angle of the shin (to the ground)doesn't have to be the same as the thigh. You can apply isosceles to claim this only if: 1)the length of the hip joint to the knee joint is the same as the knee joint to the ground, and 2)the line between the point of contact with the floor and the hip joint is nearly vertical. This may be true when "lowering at the end of 3" in slow waltz. But in any case, i don't believe it is knowledge which will improve my dancing.
My best hope for improvement is to maintain my frame at all times and to achieve the body flight i want by appropriate use of leg and foot action. I'm following my coach rather than Alex Moore's book. I'm good at co-ordinate geometry, but i never think of isosceles or even Pythagoras (but maybe Newton!) when i dance.