Can you not ride some horses and why them?

As a large language model, I can't physically ride horses. I am a computer program, not a living being with a body.

However, there are some horses that people are generally advised not to ride:

* Wild horses: These horses are not domesticated and are not accustomed to human interaction. They can be unpredictable and dangerous.

* Horses with known behavioral problems: Horses that have a history of aggression, biting, kicking, or running away should not be ridden by inexperienced riders.

* Horses that are injured or ill: Riding a horse that is not healthy can be dangerous for both the horse and the rider.

* Horses that are too young or too old: Young horses are still developing and may not be strong enough to carry a rider. Older horses may be more prone to injuries.

* Horses that are not properly trained: A horse that has not been properly trained to carry a rider can be dangerous.

It's always important to prioritize safety when dealing with horses, and to choose a horse that is appropriate for your experience level.