A hobby horse is a toy that looks like a horse but doesn't really have a real horse inside it. It is made of different materials like fabric, wood, or sometimes even plastic. It usually has a stick or "pole" at the bottom that you hold onto and then bounce around like you're riding a real horse.
You might pretend that you're riding a horse in a race or on a farm. You can have a lot of fun playing with a hobby horse because you can pretend you're really riding a horse even if you don't have a real one to ride.
Some hobby horses even make sounds like a real horse! They can neigh, whinny, or even make the sound of hooves hitting the ground.
So, a hobby horse is a fun toy for kids to pretend they're riding a horse without actually needing a real horse.