Sometimes you want to know less about how and more about what to do. Below are links to posts which offer you a variety of exercises to try.
http://schoolyourhorse.blogspot.com/2011/04/theres-more-to-schooling-than-circles.html
http://schoolyourhorse.blogspot.com/2011/11/blow-away-your-winter-blues.html
http://schoolyourhorse.blogspot.com/2011/11/blow-away-your-winter-blues.html