Final answer:
The best development of healthy body composition involves a sensible diet, resistance training, and cardiorespiratory endurance exercise to ensure overall physical fitness and health.
Step-by-step explanation:
Healthy body composition is developed best by a combination of factors, including nutrition and diet, resistance training, and cardiorespiratory endurance exercise. This multifaceted approach ensures that various aspects of fitness are being addressed, leading to optimal physical condition. A sensible diet ensures that your body gets the necessary nutrients, energy, and balance, while resistance training contributes to muscle strength and increased muscle mass. Cardiorespiratory endurance exercises such as cycling, walking, and running are essential in promoting cardiovascular health and muscular endurance. Therefore, the most effective way to develop a healthy body composition includes these three key components.