1. Fitness instructor: Fitness instructors can earn income by guiding customers to make a healthy lifestyle, while maintaining good health and healthy living habits, thus prolonging their life.

2. Food scientists: Food scientists can develop healthy food to earn income, while ensuring a healthy diet and a longer life.

3. Health experts: Health experts can provide customers with health management and health guidance to earn income and help customers improve their health and prolong their life.

4. Fitness equipment dealers: Fitness equipment dealers can earn income by selling fitness equipment, and can also help customers improve their health and prolong their lives.

5. Healthy diet consultant: Healthy diet consultant can earn income by providing healthy diet advice and guidance, and can also help customers improve their health and prolong their life.