Which of the following is NOT a characteristic of a well-balanced horse?

A well-balanced horse is often characterized by several specific traits that contribute to its overall health and function. Quality refers to the horse's refinement and the presence of desirable traits in its conformation and movement. Structural correctness focuses on the horse's bone structure and joint alignment, ensuring that it can move efficiently and withstand the rigors of various activities. Muscling pertains to the horse's muscle development, which is vital for performance, strength, and overall athleticism.

Weight, while important for a horse's health, is not a definitive characteristic of balance in the same way that quality, structural correctness, and muscling are. A horse can be of a healthy weight but still not be well-balanced if its conformation or muscle distribution is off. Thus, weight does not directly indicate whether a horse is balanced in terms of its structure and overall athleticism. Therefore, weight stands out as the aspect that is not a defining characteristic of a well-balanced horse.