Aspects of Straightness
The USDF Glossary of Judging Terms defines the aspects of straightness as:
1. Proper alignment of the horse’s body parts from tail to poll (e.g., not a popped shoulder or twisted neck).
2. On straight or curved lines, parallelism of the horse’s longitudinal axis to the line of travel, with the hind hoof prints in line with the front hoofprints (e.g., haunches not left or right of centerline or circle line).
3. In two tracks/lateral work, parallelism of the horse’s longitudinal axis to the line of reference (e.g., haunches not leading or trailing in leg yield).
4. Directness of line of travel—the horse not deviating or wandering left or right of the desired path of travel (weaving).