To avoid slouching, imagine that you have a headlight—or "heart light"—shining there at the center of your heart. Make sure the beam shines forward, not down in your lap when you're sitting or toward the floor when you're standing. To find what's known as the "center of the heart," gently tap yourself on your sternum with the fingers of one hand. You can find the sternum toward the top of your torso between your nipples. This is where the heart chakra, or heart center, is. This area should be open (and shining) in most yoga poses, and when you are sitting or standing in regular life.
Light visualization can also be used as a tool in meditation. Bring your awareness to individual parts of the body and imagine it illuminated. The purpose is to make you aware of the essentially spiritual, or subtle, nature of the physical body, which Tantrikas regard as a condensed form of divine light, or divine sound vibration.