Exercise intensity directly impacts caloric expenditure, with higher intensity leading to greater calorie burn both during and after the workout. High-intensity exercise elevates the heart rate and increases muscular demand, resulting in more calories being used. Additionally, it triggers the afterburn effect, where elevated metabolic rates continue to burn calories post-exercise. Conversely, lower intensity activities may result in fewer immediate calories burned but can still contribute to overall fitness and are important for recovery and sustainable long-term exercise habits.