person walking and then running down a long flight of stairs

person walking and then running down a long flight of stairs. The stairs are concrete with black anti-slip mats on some of the steps. The walls are light grey, with handrails on both sides and bright rectangular lights along the ceiling. The person is wearing white shoes and a black backpack with yellow designs. The initial view from the room shows a window looking out onto a street with buildings and traffic. The floor is a light beige color. The room appears to be in an apartment building or similar residential space.