42K

42ktools, also known as Marathon Tools, is a running resource website designed to help runners plan training, choose equipment, and explore races and routes. Its training section includes self-assessment resources, interval-running guidance, beginner marathon plans, 16-week schedules, personal-best training plans, Yasso 800 workouts, and pace-splitting tools. Runners can browse and compare shoes through brand listings, searchable filters, an overview, and a shoe-positioning chart that helps explain differences beyond written specifications.

The site also publishes running fundamentals and practical articles, including guidance for new runners and information about common issues such as ankle sprains. For race planning, it provides Taiwan, China, and worldwide race listings, along with details about individual events and route analyses. Users can browse existing routes and recently added route introductions, with distances and dates shown where available.

The website also shares development updates about new shoe data and route content. With its mix of training tools, gear information, race calendars, and route resources, 42ktools supports runners at different stages of their running journey