The common nutrient essential for energy production during workouts is carbohydrates. These macronutrients are the body's primary energy source and are stored as glycogen in muscles and the liver. During exercise, carbohydrates are converted into glucose to fuel various physical activities, from high-intensity training to endurance exercises. Sufficient carbohydrate intake is crucial for optimizing performance, enhancing recovery, and sustaining energy levels. Inadequate carbohydrate consumption can lead to premature fatigue and impaired exercise capacity, affecting overall fitness outcomes and making it essential for individuals to focus on balanced nutrition for their workout regimens.