How does exercise generate heat?

Exercise generates heat primarily through the metabolic processes that occur in muscles as they contract. When muscles work, they convert stored energy (from carbohydrates and fats) into mechanical energy, releasing heat as a byproduct of this conversion. Additionally, increased blood flow to the muscles during exercise enhances thermogenesis, further contributing to heat production. This rise in body temperature during physical activity is a natural response to help maintain optimal physiological function.