Core Insights - The Hong Kong Four Trails Ultra Challenge (HK4TUC), founded by Andre Blumberg in 2012, is designed for individuals seeking to push their limits through a challenging 298-kilometer course across four major hiking trails in Hong Kong [1][3][4] - The documentary "Four Trails" showcases the unique appeal of the HK4TUC and has achieved record box office success for documentaries in Hong Kong since its premiere at the Hong Kong Asian Film Festival in late 2023 [1][8] - The 2021 edition of the HK4TUC marked its 10th anniversary and was conducted under strict COVID-19 regulations, with a special theme of "breaking 50" aimed at completing the race in under 50 hours [7][9] Event Overview - The HK4TUC requires participants to complete four trails: the 100-kilometer MacLehose Trail, the 78-kilometer Wilson Trail, the 50-kilometer Hong Kong Island Trail, and the 70-kilometer Lantau Trail within a maximum of 72 hours [3][4] - The event has strict rules regarding external support, prohibiting the use of headphones and requiring participants to carry their supplies or purchase them along the route [7] Documentary Production - The documentary "Four Trails" took nearly three years to edit and has a runtime of 101 minutes, winning the audience award for Best Film at the Hong Kong Asian Film Festival [8][12] - The film features personal stories of participants, highlighting their emotional and physical experiences during the race, and was filmed with a focus on capturing the essence of each runner's journey [11][14] Participant Stories - The film presents various participants, including Liang Junqiang, who unexpectedly completed the race in under 50 hours, and Nikki, an experienced female runner over fifty, showcasing the diversity of motivations and experiences among competitors [14]