"Different organs of your body are governed by different devas. The solar plexus is connected with the SUN - which is why it is called the "solar" plexus. The solar plexus has a profound impact on the central nervous system, the optic nerves, the stomach and what we usually call out "great feeling". It is the second brain in our bodies.
Usually, the Solar Plexus is slightly bigger then an almond. But with the practice of Yoga, Meditation and Pranayam, the solar plexus can become as large as a human hand. It can then balance the bodily functions. When the solar plexus expands, the intuitive mind improves and the mind becomes clear and focused. When the Solar Plexus contracts, you feel miserable, sad, depressed, and all sorts of negative feelings.
WHEN THE FIRST RAYS OF THE SUN fall on the solar plexus, it is beneficial for your body. Doing Sun Salutations in the early morning is an excellent way to expand the solar plexus …. " - Sri Sri Ravi Shankar
Translation - Do Yoga First thing in the morning and BE HAPPY!!