Did it help with alignment Karen? (and yeah, 75-95 dollars is the going rate in these parts as well so go for it Justine!!)
The best way to make you understand the point I am trying the make is to visualise Jen Selter lower back.
Now visualise Serena williams---She is an athlete but anatomically she has been blessed. She has built what is known as a gluteal shelf
On a serious note, both ladies are blessed with an advantageous skeleton. Bones also come
into play!