Three-day eventing—also known as eventing, combined training, and/or horse trials—is one of the Olympic equestrian disciplines governed internationally by the International Equestrian Federation and by the United States Eventing Association (USEA) in the U.S. It involves a horse-and-rider competing in three sports—dressage, cross-country, and show jumping. The name can be misleading since some events at lower levels run over one day while the highest-level international competitions run over four days, depending on the number of entries. This discipline is also known as the triathlon of equestrian sports. Horse Illustrated covers news and publishes features on how to get started, how to improve yours and your horse’s skills, exercises to do for practice, tack and gear options, stories from participants in the discipline, and more.