The Runner's Journey: Identifying Design Opportunities 3. Practical Rules for Performance
The most direct match for "Runner3" is the development of the program. This qualitative study used the "Intervention Mapping" framework to create an online system that provides feedback on training volume and injury risk to help adult recreational runners avoid common injuries. Runner3.rar
If you are interested in the digital side of running (suggested by the .rar file extension), this paper explores how technology can bridge the "intention-behavior gap" to keep amateur runners motivated. The Runner's Journey: Identifying Design Opportunities 3
The program focuses on enhancing a runner's knowledge and self-efficacy to change behaviors that lead to injury. Source: RunIn3: The Development Process 2. The Runner’s Journey & Technology If you are interested in the digital side
It identifies design opportunities for technology to prevent "motivational loss" and dropout due to injury.
If "Runner3" actually refers to the video game Runner3 (the rhythm-platformer), the most relevant academic research would be in the field of . This thesis explores speedrunning as a community practice of completing games as fast as possible through glitches and efficient play. Source: Speedrunning as Community and Practice (PDF) Ten simple rules for better running. - ResearchGate
For a more general but highly practical read, this paper synthesizes dozens of studies to provide "rules" for better running.