wow... collection... Um... I'm not very good at explaining things so people may come in and scream "IGNORE FARMPONY"...if they do... well... like I said, I'm not very good at explaining things...
When a horse is "collected" it is traveling in a balanced frame, it is moving from the rear end. Once you've seen the difference between a collected horse and one that travels on it's front end you'll see the difference. People will tell you that you can FEEL the difference... I'm still working on that.
Maybe if some people could post pix of a collected horse and a strung out horse...
"Be a best friend, tell the truth, and overuse I love you
Go to work, do your best, don't outsmart your common sense
Never let your prayin knees get lazy
And love like crazy"