What should a trainer assess in a young horse's movement and conformation before deciding how to develop it?

Assessing a young horse's movement and conformation before beginning its training development allows the trainer to set realistic expectations, identify potential soundness vulnerabilities before they become problems, and design a training program that works with the horse's natural qualities rather than fighting them. Conformation assessment for training purposes focuses on the structural qualities that affect movement efficiency and soundness under work. A well-angled shoulder with a long humerus allows free forward reach of the front leg — the conformation associated with a swinging, ground-covering stride. A steep, upright shoulder restricts the shoulder's range of motion and produces a choppy, short stride that no training can fully compensate for. Similarly, a well-angulated hindquarter — with appropriate angles through the hip, stifle, and hock — allows the hind leg to reach under the body and provide drive, while a straight behind or post-legged hindquarter limits engagement and predisposes the horse to hock and stifle problems. Movement assessment at liberty — watching the horse move freely without a rider's influence — reveals the horse's natural tendencies: whether it naturally travels straight or crooked, whether it overrides at the trot, whether its natural lope is three-beat and correct or shows any tendency toward four-beat, whether it moves with a loose and swinging back or a tight and choppy one. These natural tendencies tell the trainer both what to develop and what to be cautious about. Warwick Schiller adds the behavioral assessment component: how does the horse respond to novel stimuli at liberty? Does it investigate or flee? Does it recover quickly from startles or remain activated for extended periods? Does it seek the company of other horses or is it content to operate somewhat independently? These behavioral qualities are as predictive of the training challenges ahead as any conformation assessment.