Core Insights - The extreme weather during the Yellow River Stone Forest Mountain Marathon led to significant casualties, with 21 participants confirmed dead and 151 rescued, raising concerns about the safety measures in place for such events [1][2]. Group 1: Event Overview - The marathon took place on May 22 in Gansu Province, China, and was affected by sudden extreme weather conditions [1]. - A total of 151 participants were rescued, with 8 sustaining minor injuries and 21 found deceased [1]. Group 2: Safety Concerns - There is widespread public concern regarding the adequacy of safety measures and the timeliness of rescue operations during the event [1]. - Expert opinions highlight that the nature of trail running inherently carries higher risks due to challenging terrains and the potential for delayed rescue [2][3]. Group 3: Expert Commentary - Sports marketing expert Wang Chao criticized trail running, stating that it requires higher physical demands and poses significant risks due to inaccessible routes [2]. - Wang noted that the sudden weather changes were a core factor in the incident, suggesting that while organizers may have prepared, they likely underestimated the severity of the conditions [3].