Hath yoga Is a branch of yoga that uses physical techniques to try to preserve and channel vital force or energy. The Sanskrit word हठ haṭha literally means "force", alluding to a system of physical techniques. Some hatha yoga style techniques can be traced back at least to the 1st-century CE, in texts such as the Hindu Sanskrit epics and Buddhism's Pali canon.The oldest dated text so far found to describe hatha yoga, the 11th-century Amṛtasiddhi, comes from a tantric Buddhist milieu. The oldest texts to use the terminology of hatha are also Vajrayana Buddhist.
Yoga” means union. Today, modern science has proved that the whole existence is just one energy. So if all this is one energy, why is it that you are not experiencing it that way? If you can break the limitations of the illusion that you are separate, and begin to experience the oneness of the existence, that is Yoga. The religions of the world have always been talking about God being everywhere. Whether you say God is everywhere or everything is one energy, is it any different? It is the same reality. When it is mathematically deduced, we call it science. If you believe it, we call it religion. When you find a method to get there, we call it Yoga.