To improve metabolic rate naturally, one can focus on increasing physical activity, especially through resistance training or high-intensity interval training (HIIT). Engaging in regular exercise helps build lean muscle mass, which burns more calories at rest. Additionally, incorporating more protein into meals can boost metabolism as it requires more energy to digest. Staying well-hydrated is also crucial, as even mild dehydration can slow down metabolic processes. Furthermore, ensuring adequate sleep and managing stress levels can enhance metabolic function and energy expenditure.