The primary macronutrient that provides energy during physical activities is carbohydrates. Carbohydrates break down into glucose, which serves as the body’s main energy source during both aerobic and anaerobic exercises. They are vital for endurance activities, supporting sustained energy levels. While fats and proteins are also important macronutrients, they serve different roles. Proteins mainly aid in muscle repair and growth, while fats provide energy for prolonged low-intensity activities. Therefore, adequate carbohydrate intake is crucial for optimal physical performance.