Workout intensity is directly related to calorie burn; higher intensity workouts typically result in more calories being burned both during and after the exercise. During high-intensity workouts, the body uses glycogen stores and burns fat for energy, leading to greater energy expenditure. Additionally, high-intensity training can elevate the afterburn effect, increasing metabolism even after the workout is finished. Striking a balance between different intensities in a routine is essential for maximizing fat loss while also building endurance and strength.