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.