5. ...reverse these cues for a few small circles to the right. Repeat the circles in each direction, then let your horse move off down the trail again, allowing him to relax until he tries to grab another bite.

When he does snatch again, if the terrain allows, move him forward at an extended trot for 50 feet, then bend him onto a circle, then trot on for 50 feet and then circle again, for two or three cycles. This combination of brisk trotting and repeated bending and turning is particularly demanding. You can vary the pattern to make it interesting, too--ride serpentines, zig-zag up and down rises, or even circle around some bushes or trees. Don't work your horse until he's dripping sweat--that's overdoing it. But push him hard enough to establish the connection in his mind between illegal eating and exertion. With time, he'll give up the one to avoid the other.

This article is excerpted from Clinton Anderson's Training on the Trail. Visit HorseBooksEtc.com or call 1-800-952-5813 to order the book.