BACKGROUND: The widespread use of smartphones and the internet has transformed communication, but excessive use has raised concerns about smartphone and internet addiction, which can lead to psychological, physical, and social issues. The objective of this literature review is to explore the relationship between smartphone and internet addiction and physical activity, particularly focusing on whether physical exercise, especially sports, can serve as a protective factor against addiction. The review aims to examine how physical activity can reduce the negative impacts of addiction and improve overall mental health. METHODS: This review synthesizes empirical research on smartphone and internet addiction and its connection to physical activity. It examines studies exploring how addiction leads to physical inactivity and how participation in physical activities, especially sports, can counteract this effect. The review also evaluates research on psychological mechanisms, such as self-esteem, self-control, and emotional resilience, that mediate the relationship between physical activity and addiction. Additionally, it discusses how sociodemographic and contextual factors influence this relationship. CONCLUSIONS: The findings consistently show an inverse relationship between smartphone and internet use and physical activity, with physical activity acting as a protective factor against addiction. Sports and other physical activities have been linked to reduced addictive behaviors, enhanced psychological well-being, and improved emotional resilience. Promoting physical activity, particularly sports, along with psychological interventions, appears to be an effective strategy for preventing and treating smartphone and internet addiction. Future research should focus on developing tailored interventions and studying diverse populations to optimize addiction prevention.