Which physical change characterizes collection in the horse?

• A. Back flattened with extended breathing
• B. Engagement of the hindquarters with rounding of the back
• C. Only the neck is lifted and hindquarters are loose
• D. No change in back or engagement

Answer: (B)

Collection is a higher level of gait where the horse carries more weight on the hindquarters and uses the back to elevate the forehand, creating a compact, uphill frame. The most characteristic change is hindquarter engagement paired with rounding of the back, which shortens the stride while improving balance and impulsion.

This is why the description of hindquarters actively engaged with a rounded back best fits collection. In contrast, a flattened back with extended breathing suggests a hollow or overexerted posture, not the rounded, uphill contour of collection. Lifting only the neck while the hindquarters remain loose describes an imbalance with no proper hindquarter engagement. And if there’s no change in back or engagement, the horse isn’t in a collected state.