Gradually increasing activity levels safely can be achieved through a structured approach. Start with low-intensity exercises and progressively incorporate more challenging workouts over time. A recommended method is the 10% rule, which suggests increasing duration or intensity by no more than 10% each week. Another effective strategy is to set specific, incremental goals that allow for measured growth without risking injury. Scheduling regular rest days is also essential to permit recovery. Lastly, listening to your body and adjusting plans according to how you feel is vital for sustained progress.