They need lots of exercise because horses are high energy animals. Lunging them or taking them for a nice ride each day would be sufficiant.
Oats and grains are high energy foods, great for horses that get frequent exercize.
I ride horses because my horse needs exercise. If I don't ride her, she wouldn't receive any exercise, and her health would decline.
There are many people trying to rehome horses for free these days however it would be your job to insure the animal they are offering will meet your needs from the kind or gentle standpoint.
yes horses are great companions
Horses need their hooves trimmed, teeth floated, vaccine shots, monthly wormer, and proper grooming and exercise. If that is what you are asking.
Usually horses don't show people exercise, people exercise their horse. But they can make great companions for their people. Nothing is better than just 'hanging' with your horse. They smell so good and they are just great to be with. One of my favorite times is being in the barn on a rainy day just grooming and chatting with my horses. (I always talk to my horses) And if you are kind to them and of course feed them they will always be glad to see you.
they run around and play.
calories and salt
yes
they are used to exercise horses
Yes.
yes