Yoga is the cessation of mind. when there is no mind you are in Yoga, when there is mind you are not in Yoga. So you may do all the postures but if the mind goes on functioning, if you go on thinking, you are not in Yoga.
“Technology comes from the mind, and religious technology also comes from the mind – yoga, mantra, yantra. Yoga means body postures, which can help you to go deep inside yourself; they are created by the mind. That is religious technology.