Our body is made up of organic materials (bones, blood, flesh, etc.) and an energetic apparatus consisting of nadi( channels through which prana or vital energy flows). At each intersection of the nadis there are chakras for every dimension.
These chakras, regulate the flow of prana through the nadis and exchange prana with the outside. The main chakras are aligned along the most important path of passage of the body stimuli or the spinal column. Each of them governs one of the main nerve plexuses and one of the endocrine glands.
It is natural to understand how, by working on the chakras, one intervenes simultaneously on the nervous system and the endocrine glands (and vice versa). The activation of the nervous system and glands has pranic effects.
Each asana has a particularly powerful and beneficial effect on one or more glands, nerve plexuses and chakras.
For example, sarvangasana (the reverse vertical position resting on the shoulders) exerts strong pressure and a beneficial massage on the thyroid gland (in the throat region) and on the cervical and pharyngeal plexus. This improves the functioning of the thyroids.
Furthermore, the fact of bringing the concentration to the throat (which is difficult to do while staying still in the position because that is the most stressed point) means controlling the prana in that region and balancing the functioning of the visuddha chakra.
On the other hand, even just bringing the concentration directly to the chakra has a similar effect, that is, it modifies the functioning of the chakra, the prana that flows through it and the entire area (which includes the nerve plexus and the corresponding endocrine gland).
We have therefore seen how body, breath, mind, thought and prana are interconnected; by bringing the concentration on a particular point (a chakra). In short, prana goes where the mind is concentrated.
There is another even more delicate thing that we can achieve through asanas and other yoga techniques, most notably, being able to physically influence the individual. By exploiting the main characteristics of the chakras.
If you recall, our five bodies are physical, pranic, lower mental, upper mental and the body of bliss.
The chakras also have a similar structure: physically they are glands, nerve plexuses and tissue, pranically, they are energy vortices. From an even more subtle point of view they are incorporeal objects which, according to the metaphysical dimension involved, perform particular functions. For example, active syadhisthana chakra controls animal instincts, self-confidence and love.
Bodies and chakras are multidimensional structures connected to each other. Therefore by acting on one dimension one acts simultaneously on all the others for an overall sense of peace, harmony and wellness.