To improve a person's cardio endurance, several strategies can be implemented. Firstly, engaging in interval training—alternating between high- and low-intensity workouts—can effectively boost endurance levels. Gradually increasing workout duration and intensity over time ensures progress without causing injury. Additionally, incorporating activities, such as cycling or swimming, can provide variety and reduce burnout. Consistent aerobic exercise, such as running or brisk walking, combined with proper rest and recovery, is essential for building cardiovascular strength and stamina over time.