What is the primary source of energy for endurance activities?

The primary source of energy for endurance activities is carbohydrates. During prolonged periods of exercise, such as running, cycling, or swimming, the body relies heavily on glycogen stores that come from carbohydrates. Glycogen is the stored form of glucose found in muscles and the liver, and it can be quickly accessed to provide the energy needed for sustained periods of physical activity.

Carbohydrates are particularly important because they can be metabolized more efficiently than fats or proteins to generate ATP, the energy currency of the cells. While fats do play a significant role in providing energy, especially during lower-intensity or longer-duration activities, carbohydrates remain the preferred fuel for high-intensity endurance activities.

Proteins are not a primary energy source for endurance; instead, they play a crucial role in recovery and muscle repair. Vitamins are essential for various metabolic processes but do not provide energy directly. Hence, carbohydrates are the most effective and readily available energy source during endurance activities.