This essay delves into the reasons behind the limited engagement of single mothers in physical activities within Australia. It examines the demanding roles and responsibilities of single mothers, including the challenges related to childcare, employment, and financial constraints. The essay highlights how these factors contribute to a lack of time and resources for physical activity. Furthermore, it explores the role of social capital in supporting single mothers, discussing how access to social networks and resources can facilitate increased participation in physical activities. The essay analyzes the influence of various social groups and support systems in overcoming barriers related to unemployment, education, and gender. It contrasts the situations in Australia with those in the United States and Asian countries. The essay concludes by emphasizing the importance of societal support and flexible work arrangements to improve the well-being and physical health of single mothers.