In addition to traditional "endurance" distances of 50 or more miles, AERC includes a Limited Distance (LD) division. LD's are at least 25 miles and can be as long as 35 miles. Though originally introduced as training rides for beginning riders and horses, they evolved into their own level of competition. However, due to the difference in demands entailed by the longer distances, LD miles are counted and recognized separately from endurance miles. Occasionally, a non-competitive introductory trail ride for novice riders and horses will be offered alongside the endurance competition, generally about 15 miles long.