Inside a large, indoor riding arena, a horse is lying down in the middle of a sandy area. The horse, which appears to be white or light gray, rolls over onto its back and briefly waves its legs in the air before settling on its side. The arena has large windows along one side, offering a view of a field and some trees under an overcast sky. The arena is well-lit, likely due to the natural light coming through the windows. The walls and ceiling are constructed of a light-colored metal or composite material, supported by exposed beams. The ground is covered in a layer of sand or fine dirt, which shows clear marks and indentations where the horse has been moving. There is a letter "H" attached to the wall.