"Hatha yoga does not mean twisting your body, standing on your head, or holding your breath."
The Science of Hatha Yoga
"Hatha yoga is not exercise. Understanding the mechanics of the body, creating a certain atmosphere, and then using body postures to drive your energy in specific directions is what hatha yoga or yogasanas are about. “Asana” means a “posture.” That kind of posture which allows you to reach your higher nature is a yogasana. There are other dimensions to this, but to put it in the simplest way, just by observing the way someone is sitting, you can almost know what is happening with him, if you have known him long enough. If you have observed yourself, when you are angry, you sit one way; if you are happy, you sit another way; if you are depressed, you sit another way. For every different level of consciousness or mental and emotional situation that you go through, your body naturally tends to assume certain postures. The converse of this is the science of asanas. If you consciously get your body into different postures, you can elevate your consciousness.
Hatha Yoga Prepares the Body
Another aspect of hatha yoga, when one wants to move into deeper dimensions of meditation, is that it allows for a higher possibility of energy. If you want your energies to surge upwards, it is very important that the pipeline of the body is conducive. If it is blocked, it will not work, or else, something will burst. Preparing the body sufficiently before one goes into more intense forms of meditation is very important. Hatha yoga ensures that the body takes it gently and joyfully."
Excerpt from Sadhguru @ https://isha.sadhguru.org/us/en/wisdom/article/hatha-yoga-benefits