Nadi Shodhana or alternate nostril breathing, is a pranayam or breathing technique used to balance energy in the body. Prana, energy, flows through different energy channels called nadis. The main nadi on the left side of the body is called the Ida and the one on the right is the Pingala. The energy on the left flows downward, is governed by the moon and can calm and ground us. On the right, the energy moves upward and is activating, governed by the sun.