Plugin: EasyRider

EasyRider is a horse plugin used in the World of Eldin. It allows players to claim, tame, and train horses, llamas, and donkeys.

A full overview of this plugin can be found on the GitHub page.

Training
Horses can be trained and leveled up in three categories: Speed, Jump, and Health. Leveling up is an exponential process, meaning it takes much less time to go from level 4 to 5 than it does to go from level 24 to 25.

The effort,, that must be expended to train an ability to an integer level,  , is: Where: The effort scale factor is chosen arbitrarily by the server owner. The effort base can be computed by substituting in the effort scale,, the maximum effort,  , and the corresponding maximum level,  : where the maximum level and corresponding maximum effort are carefully selected.
 * = effort scale factor
 * = effort exponential base

OR You can just look at the tables below. I've done all the math for you.

Speed
Max Level: 30

A horse’s speed increases according to the total horizontal distance traveled on the ground by the horse while carrying a rider.

Jump Strength
Max Level: 20

A horse’s jump strength increases according to the total horizontal distance travelled in the air by the horse while carrying a rider. Fall distance does not count. You can make the horse jump, ride it off a cliff, or just ride it up and down slopes to improve jump strength.

Health
Max Level: 26

A horse’s health increases according to the total mass of gold consumed in the form of golden carrots, regular golden apples and Notch apples. The more gold it takes to craft a food item, the more it improves the horse’s health. Horses eat one food item at a time.

While all gold consumed is measured in nuggets, gold ingots are shown in the table below as an alternative should you choose to feed your horse golden apples rather than golden carrots.