ELI5: Explain Like I'm 5

Easy keeper

Okay kiddo, picture a horse that doesn't need too much food to be healthy and happy - that's an easy keeper! It's like having a horse that can eat less but still have lots of energy to run around and play. These horses are often pretty good at controlling their weight and staying at a healthy size even if they eat less than other horses. It's kind of like having a friend who doesn't need as much to eat as you do but is still just as strong and happy as you are.