The seat of the spirit is the belly (The Dan Tian in Taoist Tai Chi)
Your spirit is, however, formless in relation to the body. It takes its form from the body, not vice versa.
We are so dependent on physicality that for us everything must have shape, must have clearly defined borders.
That is not to say that your spirit apart from the body lacks definition, or that without the body, the spirit reduces to mush, but spirit is multi-dimensional, so its form and definition is difficult to comprehend by us human beings who try to define things by physical understanding.
Thus, the idea that your spirit is the shape of your body is spiritually childish. I do not mean that offensively, I am simply speaking true.
The way the spirit works, it is connected to the body by the Dan Tian, and six other lesser Chi-nodes which draw Chi from it. (Together these are the seven Chakras)
The reason that Zen meditation puts emphasis on contemplating the navel (Dan Tian) is that it is the spirit centre.
Like a string of lights, you can lay the string in any shape you want, and even make words out of the lights, but the electricity only flows along the path laid for it, but does not have the shape of its path by itself.
A river takes the shape of its flow (the path of least resistance or the lowest way) but it is liquid.
In the same way, the spirit seems to conform to the shape of the body through Chi, BECAUSE Chi flows through the body.
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Now that I have said that…
No person is perfectly symmetrical. You will be left or right handed. You will be left or right footed (your stronger hand and stronger foot may or may not be on the same side of your body.)
One side of your body is more developed than the other, and this reflects in Chi flow. One side of your Chi flows weaker than the other.
This can create the impression of inner atrophy, or inner twisting.
It does not mean that your spirit is not aligned properly or that you have any problem with your Chi.
The person who has symmetrical Chi will be ambidexterous, and probably use both sides of his brain equally. It is extremely rare for this to happen.
So, really, you are feeling exactly what you should be feeling. It is normal to have a yin side and a yang side.
(People who do Martial Arts typically report their Chi-balance seems to shift towards centre, because in their art they are developing both sides of their body to equal strength and proficiency.)