This exercise is very good for the kidneys. It will improve your vitality, skin and libido. It is helpful for the recovery from injury of the arms due to the flow of blood and chi to the fingertips. If done slowly over time will be beneficial for arthritis in this area. The gentle rocking motion is helpful for injuries to the back, slowly releasing blockages , allowing the body to naturally heal. Due to the fact it works with the kidneys, you may find your reactions improving. It can make you more aggressive in a positive way , helping you to assert yourself more as kidney function improves.