Ahh....I think I get you now. When you say "get your head over your (front or back) foot", that makes sense to me. Beginners sometimes lose their balance by throwing their heads too far over their feet, in either direction. I used to tell people (when striking) to not let their head go forward beyond their knees, or backwards past their heel, as a rule. Always exceptions, of course, but as a rule it worked pretty well to help folks maintain their balance.
AKK uses a principle called "breaking the horizon", which involves forcing the opponent to bend forwards or backwards (Hey! Get your mind out of the gutter!
), to effect takedowns or control of the opponent's arms and legs.
Thanks for the detail, Gav.