In an ancient and mysterious world, there is a man named Lin Feng. Lin Feng lives in a prosperous town, but he is tired of the surrounding noise and turmoil. He is eager to find a way to make his body and mind peaceful, healthy and long-lived. So he embarks on a journey to find the secret of health preservation.

Lin Feng asks everywhere about the whereabouts of the immortal. He has walked through many places and met all kinds of people. Some people laugh at his folly and think that the secret of health preservation is just a legend; some people show sympathy for him and persuade him to give up this unrealistic idea. But Lin Feng is not shaken by these people's words. He firmly believes that he will be able to find the immortal and obtain the secret of health preservation.

After a long search, Lin Feng finally meets an immortal on a remote mountain. The immortal has white hair, a kind face and his eyes reveal a profound wisdom. Lin Feng excitedly kneels in front of the immortal and asks the immortal to teach him the secret of health preservation.

The immortal looks at Lin Feng and nods slightly. He says, "If you want to obtain the secret of health preservation, you must pass three tests. The first test is to fast for three days to test your self-control; the second test is to soak in ice water in the cold winter to test your perseverance; the third test is to live alone in the barren mountains for a month to test whether your heart is peaceful."

After hearing the immortal's words, Lin Feng is full of determination. He unhesitatingly accepts the immortal's test.

The first test begins. Lin Feng starts fasting in a quiet room. At first, he feels very hungry and tired, but when he thinks of his goal, he tries hard to restrain his desires. He closes his eyes, takes a deep breath and calms his mood. As time passes, Lin Feng's hunger gradually lessens and his body becomes lighter and fresher. Three days later, Lin Feng successfully passes the first test.

The second test comes soon after. In a cold winter, Lin Feng comes to a frozen river. Without hesitation, he takes off his clothes and jumps into the ice water. The piercing cold instantly spreads throughout his body and he feels as if his body is frozen. But Lin Feng does not retreat. He clenches his teeth and persists. He remembers the immortal's words. Perseverance is the key to success. He constantly tells himself that as long as he persists, he will definitely pass the test. After a long time, Lin Feng finally climbs out of the ice water. Although his body is frozen stiff, his heart is full of joy and pride. He successfully passes the second test.

The third test is to live alone in the barren mountains for a month. Lin Feng carries a simple bag and walks into the deserted deep mountains. There is no comfortable bed or delicious food here, only loneliness and silence. At first, Lin Feng feels very scared and lonely, but when he thinks of the immortal's words, inner peace is the key to health preservation. He begins to learn to get along with nature. He observes the flowers, plants and trees on the mountain, listens to the singing of birds and feels the breeze. He gradually puts down his fear and anxiety and completely relaxes his soul. During the days in the barren mountains, Lin Feng learns to find food and water by himself. He also learns how to deal with various difficulties and challenges. A month later, Lin Feng walks out of the barren mountains. Although his body is tired, his eyes reveal a kind of firmness and confidence. He successfully passes the third test.

Lin Feng returns to the immortal. The immortal looks at him with a smile and says, "You have passed three tests, proving that you have enough self-control, perseverance and inner peace. Now, I will teach you the secret of health preservation."

The immortal tells Lin Feng, "The secret of health preservation lies in self-discipline, perseverance and inner peace. Self-discipline can enable you to control your desires and maintain a healthy lifestyle; perseverance can enable you not to give up easily when facing difficulties and challenges; inner peace can enable you to get rid of external interference and maintain a peaceful state of mind. Only when you have these three qualities can you truly achieve the goal of health preservation and have a healthy and long-lived life."

After hearing the immortal's words, Lin Feng is full of gratitude and joy. He finally finds the health preservation secret he has always longed for. He decides to return to his hometown and teach this secret to more people.

Lin Feng returns to the town. He begins to tell people about his experiences and the immortal's health preservation secret. At first, many people do not believe his words, but as time passes, more and more people see Lin Feng's changes. His body becomes healthier and his mentality becomes more peaceful. People begin to ask Lin Feng for health preservation methods. Lin Feng unsparingly teaches everyone what he has learned. He tells people that health preservation is not only a physical maintenance but also a spiritual cultivation. Only when we learn self-discipline, perseverance and inner peace can we truly have a healthy and happy life.

Under Lin Feng's influence, people in the town begin to change their lifestyles. They no longer indulge in material enjoyment but pay more attention to their physical and mental health. They learn to have a reasonable diet, moderate exercise and maintain a good state of mind. The atmosphere in the town also becomes more and more harmonious and people's lives become more and more beautiful.

This story tells us that the secret of health preservation not only lies in external methods and skills but also in our inner qualities and attitudes. Only when we have self-discipline, perseverance and inner peace can we truly achieve the goal of health preservation and have a healthy and long-lived life. At the same time, this story also reminds us that on the road of pursuing health preservation, we cannot be eager for quick success. Instead, we should be down-to-earth and move forward step by step. Only in this way can we truly understand the true essence of health preservation and enjoy a healthy and happy life.

Taoist thought emphasizes conforming to nature and governing by non-interference. In this story, the immortal's test also reflects the essence of Taoist thought. Fasting for three days tests Lin Feng's self-control and makes him learn to conform to the rhythm of nature and control his desires; soaking in ice water tests Lin Feng's perseverance and makes him learn not to give up easily when facing difficulties and challenges and stick to his beliefs; living alone in the barren mountains for a month tests whether Lin Feng's heart is peaceful and makes him learn to get rid of external interference, return to nature and maintain a peaceful state of mind. Through these three tests, Lin Feng not only obtains the secret of health preservation but also understands the wisdom of Taoist thought.

In modern society, we are often troubled by various desires and pressures and forget the importance of health preservation. We should learn a lesson from Lin Feng's story and learn to conform to nature and maintain inner peace. We can maintain health preservation through reasonable diet, moderate exercise, maintaining a good state of mind and other ways to relax and nourish our body and mind. At the same time, we should also learn to put down our desires and pressures, return to nature and enjoy the beauty of life. Only in this way can we truly achieve the goal of health preservation and have a healthy and happy life.