four people in what appears to be a schoolyard, participating in a game or activity

four people in what appears to be a schoolyard, participating in a game or activity. Three of them, wearing white shirts and dark pants, are crouched on the ground along a white line marked on the brick-paved surface. They are leaning forward with their hands on the ground, seemingly ready to start some kind of race. The fourth person, dressed in black, is standing behind them and appears to be encouraging them. In the background, there's a building with windows, other people walking around, and some greenery. The overall environment suggests a school or educational institution during an outdoor event or activity.