The primary function of carbohydrates in the body during physical activity is to serve as a quick and accessible energy source. Carbs are broken down into glucose, which is then utilized by muscles and the brain as fuel. For endurance activities, adequate carbohydrate intake is vital, enabling sustained performance and delaying fatigue. Additionally, replenishing glycogen stores post-exercise is essential for recovery. Overall, carbohydrates play a critical role in optimizing exercise performance and supporting energy levels during physical activity.