"Just take one part of this. The forward movement of the knee towards each other. There we are both perfectly balanced because of it."

Nope.

Beginners might be forgiven for lowering vertically in place, but advanced dancer's don't do that, as it KILLS THE MOVEMENT.

Instead, advanced dancers are already progressing somewhat as the lower from foot closure. By the time they are down, the body is already projected BEYOND the standing foot.

They are still ON the standing foot of course (they won't be on any other foot until the moving foot stops moving) but they are no longer in balance OVER it - instead, they have already begun to move.

This smooth blending of the initially vertical lowering, into a nearly horizontal travel is the mark of a skilled dancers. Wheras a beginner drops in place and goes "clunk"

It would be nice if a person would use themselves as a working model.
Both feet under the body. Knees bent towards partner. Look at the angle of the shins and where is the weight of the body.
Now. Both feet under the body. Knees bent but not towards partner. Your shins are verticle and your weight is over your heels and you are sitting with the bottom sticking out.
Which is it . Weight over the balls of the foot or is it the heels. Only one is correct.

"Both feet under the body."

Wrong already!

For the backwards partner, by the time your standing foot is flat, your moving foot will not be under your body but will have released from the knee to be behind it. This occurs BEFORE your standing knee even begins to bend.

"Knees bent towards partner."

For the forward partner, yes. For the moving partner, NO, though it will appear as if the knee went forward when in fact is the body moving backwards away from the knee.

"Look at the angle of the shins and where is the weight of the body."

For the forwads partner, the shin inclines forward while the thigh stays relatively vertical, placing the knee and the body in vertical alignment, both AHEAD OF THE FOOT.

For the backwards partner, the shin does not really incline much. Instead, the thigh declines and the body moves backward away from the knee.

"Weight over the balls of the foot or is it the heels. Only one is correct."

Depends on the direction. For the forwards movement, the weight is ON the ball of the foot. For the backwards movement, it moves until it is ON the heel. In neither case does the weight remain OVER the foot - instead, it projects beyond.

You just can't go anywhere without moving your weight beyond your foot after all...

"For the forward partner, yes. For the moving partner, NO, "

Sorry, for the BACKWARD partner NO

Seriously. You have got it so wrong. Just going to one part. The man' s thigh verticle you dont use your kees at all do you. Please go to your video and look, I mean look. Have no preconceived ideas in your head. You will see an angle of the shin to the floor plus an angle with the thigh from the knee to the hip. And your weight over the ball of the foot.Also before the feet lower there is an angle comparable to what will be the angle of the shin.
With the top dancers we are looking at 45 degrees when we mention angles. None at all when we mention bad dancers

Forward, backward it doesn't matter. If the ladies thigh is verticle her weight is over her heel and she will fall backwards. The ladies shin and her thigh should be at an angle and so is the man. Look at your videos or simply go to the instructions on this site. Look at the angle of the shins and the thighs at the end of the Feather or anywhere inbetween.
Dont you think it is a bit ridiculace argueing about something that even a rank beginner can go and see for themselves with just a few clicks of their mouse..

"Forward, backward it doesn't matter."

Well, that right there is a perfect admission that you are UTTERLY CLUELESS.

"If the ladies thigh is verticle her weight is over her heel"

That is not necessairly true at all! It is quite likely that her weight will be well behind her heel, though the pressure of the weight could be supported in any part of the foot.

"and she will fall backwards."

Only if she neglected to drive into the movement. That is the basic nature of all ordinary bipedal movement - you find yourself in situations in which you must either

1) keep going

2) do something different to bring yourself to a stable stop

or

3) fall flat on your ...

"The ladies shin and her thigh should be at an angle and so is the man."

Not for a backwards lowering action. There you want to push yourslef away from your foot, and because the knee only bends forwards, you'll do this by making the upper part of the leg, rather than the lower, more horizontal. Sending your knee forwards can't send you backwards - all it does is lower you onto your foot without moving you anywhere. And the goal is not to lower "plop", it is to lower INTO movement.

"Look at your videos or simply go to the instructions on this site. Look at the angle of the shins and the thighs at the end of the Feather or anywhere inbetween."

The feather is not a lowering from foot closure! And it is an outside partner lowering, which changes things substantially! But while you are watching those feather videos, note how Jonthan's foot is flat before this moving foot has really even begun to close! Just as it should be.

"Dont you think it is a bit ridiculace argueing about something that even a rank beginner can go and see for themselves with just a few clicks of their mouse.."

Indeed, so why do you keep LYING about what is there?

I can see where your main fault lies. Just one thing one dance one step in the foxtrot going backwards. As your body arrives over the standing leg and hopefully that will include the moving foot. Where is your body
Let us just raise our heels and come upon out toes. where is our body weight. As we lower. Where is our body weight. If we have stayed verticle and lowered our weight is still in the same place. Our body weight is over the balls of the foot. We want do go lower so we bend the knees which angles the thighs and the shin, and the knees go to the front. The weight is still in the same place, over the ball. So we aren' t going for verticle lowering as in the Waltz. We are moving It doesn' t matter the heel will touch down. the knee will bend. The weight will stay over the ball. If any of you have a video of the current professional champions, just take a look in slow motion at the angle of both their thighs in the Foxtrot. Richard Gleave was asked. How low can I bend my knees. He said as low as you like as long as you don't dig a hole you can't get out of.
To get to the question. What is the angle of your thigh and your shin at the time your heel touches the floor. And where is your body weight.

On the lowering thing... Shouldn't the man make sure he doesn't lower so that he is below the lady?. Or doesn't this matter for short periods?

"I can see where your main fault lies. Just one thing one dance one step in the foxtrot going backwards. As your body arrives over the standing leg and hopefully that will include the moving foot. Where is your body"

My body arrives over my new standing foot before my new moving foot closes to it! This is true for EVERY SKILLED DANCER - though the scope of this difference will be different for different sorts of steps. It's most obvious on the lowering steps, for example 3 of a feather.

"Let us just raise our heels and come upon out toes. where is our body weight. "

On the only part of the standing foot touching the floor, obvious. As to where it is over - that will change throughout the time we are on the toe. Originally it will be off balance past the foot on one side, then it will pass over the foot, then it will project off balance on the other side of the foot. Basic human movement!

"As we lower. Where is our body weight."

In transit towards, across, and beyond the arriving foot.

"So we aren' t going for verticle lowering as in the Waltz. We are moving It doesn' t matter the heel will touch down. the knee will bend. The weight will stay over the ball."

If it does, then you ARE NOT MOVING.

YOU CANNOT BE MOVING (PROGRESSING) UNLESS YOUR WEIGHT IS MOVING. IF IT IS MOVING, IT CANNOT STAY OVER THE BALL OF FOOT! It may stay supported from pressure at the ball of foot, but it CANNOT STAY OVER THE BALL OF FOOT AND ALSO BE MOVING. It's contrary to the very definition of movement!

"Richard Gleave was asked. How low can I bend my knees. He said as low as you like as long as you don't dig a hole you can't get out of."

In other words, you can only lower as much as your horizontal travel accomodates. If you lower more than that, lower in place rather than lowering by moving, you will dig precisely the kind of "hole" he was cautioning you about. You must not lower "below" the swing - you can only lower along it.

"To get to the question. What is the angle of your thigh and your shin at the time your heel touches the floor. And where is your body weight."

For what specific step would you like this answered? Without a context, an answer would be meaningless, because it is different in each situation!