Patanjali compares Asana to resting like the divine serpent on the waters of infinity, preparing the body for meditation. Patanjali said, "Posture is mastered by freeing the body and mind from stresses and thoughts and meditating on the infinite.Prana is the life force that exists everywhere and flows through each of us as breath. Pranayama is the control of breath.
The basic movements of pranayama are inhalation, retention of breath, and exhalation. Pratyahara is withdrawal of the senses. when you are directing your attention inward during meditation. Concentration or dharana involves teaching the mind to focus on one point or image gently pushing away superfluous thoughts Uninterrupted meditation without an object is called dhyana. Concentration (dharana) leads to the state of meditation.
The goal of meditation is heightened awareness and oneness with the universe. The ultimate goal of the eightfold path to yoga is samadhi or absolute bliss, pure contemplation, superconsciousness, in which you and the universe are one. Paramahansa Yoganananda called it the state of God-Union.
Yoga transforms the Body and Mind to peace physically, mentally, and spiritually, achieving a plateau of stillness. Yoga means to unite and has its origins in Pre- Vedic Indian tradition. The real goal of yoga is Liberation by which we can achieve inner peace and harmony and heal ourselves.