I got a 7 for the stretchy circle, on my one and only test I rode. How my trainer, who is in the L program, explained it: prepare the horse at A, but don't loosen the reins yet. Make sure the horse is solidly on the outside rein. From A to B, gradually allow the reins to lengthen, but keep contact with the outside rein, and keep your hands forward (not out and down, or out an back). By X the horse should be stretched as far down as possible. From E to A gradually shorten the reins and prepare for working walk. That gives you a quarter of a circle to regroup and rebalance before the transistion.
I only showed about half a circle of real stretch, the other half was divided into two quarters. One for preparing for the stretch, the other preparing for the downward transistion.
I can't find the video right now, but the USDF has a video of te stretchy trot with judges comments. Shows three different horses (if I remember correctly). It was under their e-track section, but I stumbled on it while searching on YouTube. If I find it again, I'll post the link.
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