The posture below strengths the kidneys by stretching the lower back and the bladder meridian at the back of the legs. Dr. Stephen Chang recommends facing the kidneys and hamstrings to the shining sun to heat the tissue and organs.
The kidney sound is one of the famous Six Healing Sounds from the Taoist tradition. The sound can be made in a low and guttural manner 3-6 times. In between making the sounds, one can turn awareness inward to the kidneys and express gratitude.