A riding hall is a big, indoor space where horses can run and be trained. It's like a big room with walls and a roof - but it's much bigger than a normal room.
Riding halls are important because they let riders and horses practice even when it's raining or cold outside. When horses need exercise or training, they can go inside the riding hall and run around.
Horses can be very sensitive to weather conditions, so it's important to keep them dry and warm. Riding halls also have soft footing, which is easier on a horse's hooves and legs than hard ground outside.
People who ride horses can use the riding hall to practice their riding skills - like jumping over things or performing different movements called "dressage." Riding halls also have special lighting to help riders see what they're doing, even if it's dark outside.
Overall, riding halls are a really important place for horses and people who love them to practice and stay safe and healthy.