Screen time can negatively impact physical activity levels by contributing to a sedentary lifestyle. High amounts of screen time often replace opportunities for exercise, leading to decreased overall activity. Prolonged sitting associated with screen time can also impair metabolism and increase the risk of weight gain. Furthermore, excessive screen exposure can lead to fatigue and reduced motivation to engage in physical activities. To counter these effects, it's essential to set limits on screen time and incorporate regular breaks for movement and exercise throughout the day.