Join Date: Aug 2011
Location: Middle of Nowhere, Saskatchewan
Balance balance balance!
You want to just do circles and figure 8's and serpentines. Make sure you are riding balanced, not leaning this way or that, or too far forward, or too far back.
Do keep him from falling out of the circle, support him with your outside rein, just hold it snug, and when he goes to fall out of the circle, give him some more leg (just a squeeze!) and close your hand on that outside rein, giving it a little "wiggle" has the same effect. Refrain from just pulling and pulling on your inside rein, that makes it worse, keep the steady cue on that rein, and use that outside rein as a little bit of a support system.
I'm riding a 3 year old mare right now that fell out of her circles reaaaally bad, and I just did all kinds of circles, big, small, spirals, blah blah blah, and supported her with my outside rein like I described above and it really helped. I'll hopefully get a little video of doing the above on her soon...