Oddly enough I didn't ask for a tutorial or a lesson on each. I just wanted to know WHY each were done. Kayty, you answered it in your first post, I believe, even if you didn't understand the question.
As for the article, Luvs2Jump, I liked her style of writing and the information she gave. It also lend me to understand why Chili doesn't do so well in the arena even tho she is broke to ride. She has not been trained to lunge or work in a circular motion - big or small - and therefore, has a difficult time keeping rhythm at anything other than a walk in the arena. Thank you for the info.
I think we can close this discussion .... and I can feel much more comfortable knowing I am quite capable of sitting as opposed to posting (or rising) even if I can't quite remember how to do the latter!