I'll often use the FAST run as a warm up or a "training" run. In the video below, you'll see me make sure Cosi sticks the teeter landing. The day before, he ran off the teeter with barely a stop. We have 35 seconds to complete 15 obstacles and the bonus. I can take the time to "train" certain obstacles, not caring if we Q, place, or win. There's no substitute for the actual ring. I want to be sure he knows that the rules apply here, too, not just in the back yard or at agility class.
Here's the video of our Q in Pittsburg in FAST: