Why is it good to try different horses?

I know that it's good to try different horses from time to time, but can you list a few reasons?

Thanks :)
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Make you a more skilled rider
Teaches you to be able to deal with any type of horse
You don't alway have your horse if a friend needs you to work cows
Teaches horses to deal with different riders

And well it may teach you to ride a buck, being not every horse may be trained as good as yours.

Experience. If you ride the same horse every day, all day, you get used to how the horse works. Granted that is a good thing. But if you're riding 4-5 different horses, each one works differently. You learn how horses can handle differently.

Because each horse rides different. You learn something new from each horse.

I've noticed it helps my general riding skills A LOT to ride different horses. While the basics of riding may be similar, each individual horse seems to have different things that make her or him tick. Some are more sensitive to cues while some need a bit more motivation. Some have a smooth gait while some have a rocky one, etc etc.

Instead of being used to the same thing day in and day out, riding more than one horse makes you a better rider since you have more experience dealing with different things.

For example on one lesson horse I had no problem sitting the trot. She made it all too easy! But my current lesson horse has a trot that's quite jarring. Riding him has taught me how to better sit the trot. With out switching horses I would be "behind" in that area since I was so used to a smooth trot.

Its is good to ride different horses because you get to know how to handle different horses and how to get them working for you.

It is also good to ride horses that are trained- to improve your position and learn what the right way feels like
And horses that are not trained- to test your riding skills