Running outdoors is an increasingly popular form of physical activity and has been proven to substantially reduce the risk of major chronic illnesses such as cardiovascular disease. The topic of runnability has received considerable attention but with conflicting conclusions and remaining gaps. As discovered with previous research, the physical environment and its features significantly impact running experiences; therefore, the identification of features that encourage or inhibit runners is crucial to promoting this physical activity and overall health. A scoping review of current literature was conducted to identify the environmental factors that promote running. Online databases were used to capture all articles on runnability to date; a total of one hundred and two (n=102) papers were selected and synthesized to highlight the environmental features preferred by runners. Findings include a preference for green spaces and connecting with nature, perceptions of higher safety away from traffic congestion and pollution, and routes with wide, smooth surfaces and high connectivity to mitigate good running flow. Essentially, natural surroundings are substantially more desirable than urban settings. Studies have shown that even when a running route is within an urban environment, it is usually connected to or between green spaces.