1. Runway leveling: The playground is mainly designed and built for various sports. The track of the playground is smooth and hard, which can provide a good running surface. A smooth runway can reduce the sense of instability and friction during running, making running smoother and more comfortable.

2. Open space: The playground is an open space without obstacles and traffic interference, which provides a large exercise area, which means that runners can train in a safe and free environment, avoiding traffic problems and safety risks when running on the road.