Exercising an immature animal, by lunging for example, can put strain onto the joints and cause deformities such as splints.

• 锻炼不成熟的小马驹，打个比方通过调教索训练，会对关节施加压力以及会造成类似掌骨疣（的裂骨或炮骨的扩大）畸形。