10-08-2012, 11:10 PM
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Yep, that's the one.
There's various names for it, but the most commonly followed scale is the German Training Scale, as it was developed by the Germans.
Straightness is not about keeping your horse's body in a straight line. Straightness involves bend and flexion as well. Say you're riding on a 20m circle, the bend (through the horse's body) and flexion (from the poll and jaw) need to match the arc of the circle. On a 10m circle, the bend and flexion are obviously going to be greater to follow the arc of the circle.
Straightness/bend/flexion is why most training particularly of green horses is done on curved lines. On a curve, you ask for bend and flexion, which helps to keep the horse soft and responsive. Straight lines are only to test your training.
Straightness is about keeping the hind legs tracking equally with the forelegs, and the body of the horse being always in line with the arc of the figure you are riding. Not about having a dead straight, ridig body ;)