Active blood stream is the base for your power distribution

The power is in heaven and it moves by itself so that the four seasons, namely the hot and the cold cycles smoothly and that the all things mature smoothly. If the cycle shifts to one side it won't form smooth circle and there will be the stagnant that would generate irregularities as such, hot winter or cold summer, wild wind, too much rain and etc.

Similar matter happens in human body. Having smooth blood stream ensures your smooth power distribution throughout your body and there won't be any illness. Having bad blood stream makes you ill. In case of the blood stagnant occurs in upper side of your body, there will be the head ache or spell bound by dizziness. If the stagnant occurs in middle of your body, you will be having the heart diseases, stomach ache, heavy stomach and etc. In case of your lower body, you will be having lower back pain, beriberi, abdominal pain, hemorrhoids and etc.

Those things suggest that we will be better to watch blood stream and make it active so that there won't be any stagnant spot in our body.

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You'd notice that there were no knowledge of vitamin at the time. But then do we know all about DNA? If we don't know our own well, there is available knowledge that fits to the age, or let's say the word that express the concept nicely at the age. And that does have the power, don't you think?