Moving the shoulders across

1.  Desensitize your horse to your tools
2.  Standing at the horse's shoulder, place your rope hand up by his eye, and your other hand back by his shoulder.
3.  Walk towards his shoulder with energy until he crosses his outside front foot over his inside.  If he doesn't move off at your suggestion, use the following escalation of aids:

• Tap the air rhythmically toward his eye and shoulder
• Tap the air near his eye while taping his shoulder
• Tap his face and his shoulder progressively harder until he moves

4.  Once your horse takes a step with his shoulders, relax your body
5.  End by desensitizing your horse to your tools again.