China's marathon boom, which brought millions of runners and billions in revenue to the streets of the country's biggest cities, is now facing a deliberate slowdown. With new regulations taking effect this autumn, the focus has shifted from explosive growth to long-term stability. The Chinese Athletics Association is prioritizing safety and professionalism over sheer speed, leaving the entire industry to wonder what happens when an economy built on momentum is suddenly told to slow down. On the show: Niu Honglin, Steve & Laiming