The 22,000 runners who will gather at Tian'anmen Square for the Beijing Half Marathon on Sunday are set to experience first-hand the major changes transforming long-distance races across China.

Already, the new regulations have been witnessed at major marathons in Wuxi and Wuhan this spring, as organizers and local officials strive to improve safety standards and the quality of events.

On April 4, the Chinese Athletics Association released the 2025 China Marathon Races Blue Book ahead of the Beijing Half Marathon, which outlined the impact of the new regulations.

The total number of marathon-related events nationwide dropped to 594 in 2025 from 696 in 2024, marking the sport's first large-scale "slimming down", the Blue Book found.

However, the data also highlighted the strong growth in the economic impact and quality of marathon events. Certified events generated a direct economic impact of 18.51 billion yuan ($2.68 billion) and drove an overall economic benefit of 45.4 billion yuan, supporting 183,000 jobs, it said.

"Marathons have evolved beyond mere sporting events to become comprehensive platforms that boost city tourism, enhance regional image, stimulate consumption, and promote economic development," said Shen Hui, an associate professor at the department of physical education of Southeast University.

Shen, who is also an international-level athletics judge, added that according to industry professionals deeply involved in event execution, there is a trend toward more standardized, refined and accountable marathon event organization and management.

"While disparities still exist in cities with different foundational conditions or in niche events with limited resources, the direction is clear: moving from rough to precise, from perfunctory to responsible," she said.

The Blue Book's analysis of 284 A-class certified events underscored how "reduction in quantity" is fueling a surge in quality, reshaping not just running but urban economies and public health nationwide.