1. Enhance muscle strength and bone density: With the increase of age, muscle strength and bone density will gradually weaken. Proper exercise, such as weight lifting and aerobic exercise, can strengthen muscle strength and improve bone density, thus making people look younger.

2. Improve blood circulation: Exercise can promote blood circulation, make oxygen and nutrients more effectively transported to all parts of the body, help cell metabolism and slow down the aging process.

3. Relieve stress: Exercise can help people release stress and relieve tension. Maintaining a good mental state for a long time helps to delay aging.

4. Improve the quality of sleep: Exercise can improve the quality of sleep and make people have a better rest and recovery during sleep. Adequate sleep is very important to stay young.

5. Enhance self-confidence: build a better figure and improve your physical fitness through exercise, which can enhance self-confidence and make people look more energetic and younger.

6. Socialization: Gyms, sports clubs and other places are good places for people to meet new friends and expand interpersonal relationships. Associating with people can keep people young.

In a word, fitness can not only improve physical condition, but also adjust mental state, making people look younger. Of course, if you want to stay young, you need to pay attention to the comprehensive conditioning of diet and work and rest.