Used specifically for discussing the ability to ride horses, not other activities. The equestrian center offers courses to improve your equitation.
Pro Tip 2/3
Not Just Riding
Implies knowledge of techniques and forms, not just the act of being on a horse. She's taking equitation lessons to master different riding styles.
Pro Tip 3/3
Formality Aspect
A formal word often used in professional or sporting contexts rather than casual conversation. Participants are judged on their equitation and control of the horse.