A major part of Western riding is pattern placement. If you're not in the correct position going through the cones you're not going to get your lead changes in the correct spots. Robin Frid talks about pattern placement in Western riding and the importance of learning where you are in the pattern.
The back through obstacle is a part of every trail pattern, and requires strategic placement of your horse's body in order to avoid hitting any poles. Robin Frid shows you how he likes to practice this obstacle at home so his horses aren't rushing it in the show pen.