Just like in the Qin Dynasty, Xu Fu crossed the East China Sea to find an immortal elixir for Qin Shihuang, ensuring that Qin Shihuang would live forever and dominate the Spring and Autumn Period forever. In Taoism, there are schools that specialize in alchemy and medicine (including alchemy), with the aim of achieving immortality. The Journey to the West, the four classic novels, doesn't write about the old man's alchemy, but isn't it also for immortality?
And keeping in good health is something that everyone can do, regardless of the amount of money. Because health care is a hot science now, some businesses sell health care drugs under the banner of health care, and the price is also very high. I think if you want to keep fit, you must change your attitude towards life instead of spending a lot of money on this so-called health care medicine.
There is a good saying: the fairer thing in the world is that in the absence of catastrophe, the happiness and health of life have nothing to do with the amount of money, but have a lot to do with the attitude towards life.
I think keeping in good health is actually very simple. We should have a regular work and rest, a reasonable diet, and keep a happy attitude in our daily life.