1.homer does not say whether or not the pre turn hip execution should be in preliminary address impact fix or adjusted, he simply says before starting back, simply at some point before startup...
2.semi lock means just that, they are locked at a predetermined point before starting back but are not permanently locked thereby making them immobile and we certainly wouldn't want that for the downstroke... So semi lock them... The point of the preturned hip is to stop the shoulder motion at a preselected point, PREselected, of course you can do whatever you want! That is the beauty of it, you can create your own variation! However I think his intent was as stated to preturn a selected amount prior to startup and not move past that In The backstroke.
3.of course the hip turn will affect knee action and once again this comes down to your choice, can I preturn my hip and have a stratright leg? Yes! Can I do the same and have right anchor? Yes!
Some of this depends on the amount of hip turn you want...standard knee action allowing more hip turn...also easier to have more hip turn AND a centered pivot...see pics of AP da King in earlier posts....Beautiful lines by the King.
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