USDF Definition of “Throughness”
“Throughness” is the supple, elastic, unblocked, connected state of the horse’s musculature that permits an unrestricted flow of energy from back to front and front to back, which allows the aids/influences to freely go through to all parts of the horse (e.g., the rein aids go through to reach and influence the hind legs). “Throughness” is synonymous with the German term “Durchlaessigkeit,” or in English, “throughlettingness.”
Mica Mabragana rides Infanta from the inside leg to the outside rein on a precise circle to develop throughness. The cylindrical shape of the outside of the horse’s body is a sign of throughness.