RE: Bending at the waist? Contorted?
Think of it this way Jeff.............you could conceivably turn your hand upside down before you attach your release to the string, draw back and find a way to get the peep into alignment with your sight housing.
That doesn't mean the arrow is going to go exactly where you want it.
Keeping your same anchor is vitally important like Rob mentioned.
You draw and set your anchor then move YOUR BODY to the target mainaining that anchor.
It's not a gun where front sight + rear sight = bullseye as long as they're lined up. How your hand relates to your face and how that arrow comes off is a big part of it. This is the reason I can't take my buddy Frank's bow set at 26.5" and expect to hit the same place he does even though I have those 2 circles (peep and housing) perfectly aligned.
The whole bend at the waist is a 'Do the best you can" to keeping your alignment. We're not Gumby so it's impossible to just bend at the waist , and hold perfect T alignment to the targtet.
The goal is to keep it as close to where you were on level ground.
You just don't want to stand dead erect and simply drop your bow arm down to the target and draw........you have no chance to repeat your level ground anchor.