OK, so first, the obvious. Yes, I know this is a Vallhund video
The A-frame is lowered to the full length of the chains. Darby and Breezy were precariously trying to climb the full-height A-frame during a super high speed frap session, so I felt it safer to lower it.
I never taught this to Darby, she just started running up and over the A-frame, and then one time she took her ball. I don't know if she got nervous at the top and thought she couldn't "walk and chew bubble gum" to get back down with the ball in her mouth, but she dropped it, and the ball rolled down the frame. Well, that looked like fun, so Darby ran after it, and then back up, roll, chase down, etc. etc.
Maybe she does have a future in agility? Or as a circus dog?