The primary role of carbohydrates in a fitness-focused diet is to serve as the main energy source for the body. Carbohydrates are crucial for maintaining optimal blood sugar levels during exercise and promoting recovery afterward. Consuming complex carbohydrates, such as whole grains, fruits, and vegetables, provides sustained energy, which is essential for both aerobic and anaerobic workouts. Additionally, carbs help replenish glycogen stores depleted during physical activity, ensuring better performance and endurance.