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SongofWind said..This is an example of "perfert 7 stance". Shoulders, hips and feet are perfertly in line. But this works only only flat water and steady wind or going upwind only. Of course old school, from a 1999 photo (not me

) Short lines and narrow footstrap spread as compared to front straps to mast foot

Quite a sail! I wonder how they justified that leech.
But what is he doing with his feet?
The photograph also shows the rig mast rake - just imagine how raked-back it would look if we levelled the horizon in this photo.
Just to clear up the old school stance versus modern stance question:
There are indeed many stances for different types of kit we now sail. The 'perfect 7' stance is a good visual key to what we should be aiming for but that is directed at intermediates learning to plane their boards better. When turning you should have your knees more bent, and if blasting downwind you'd certainly have your back leg more bent etc.
The signs that people are still stuck in old school stance are more basic. 1) Too much mast rake 2) Lines too short 3) Feet too close together and miles from the mast foot. This stance can still work for blasting but gets dissed now because it 'traps' you under the rig, making it hard for you to gybe the board or to respond to other board trim needs - so you become the passenger, not the driver.
It's the excessive mast rake that effectively drops the boom which in turn makes you believe you need short harness lines.
With a modern stance we use the rig more upright, and longer harness lines plus a waist harness allow you to shift your weight more readily to adjust board trim and/or to move the rig forwards or back. Those principles apply to all types of windsurfing.