As a result of their calm and docile nature, many adults enjoy riding these horses. Some adult riders will even compete on Pony of the Americas.  As a result of the pony's unique characteristics, such as their small size and high intelligence, some adult riders enjoy riding the ponies. However, due to the ponies' physical characteristics, most adults find it difficult to ride them. This is especially true when the adult is very tall or very heavy. Also keep in mind that the horse is not supposed to carry more that 20 % of its weight. Overloading your pony can result in his back pain and injuries.