Positive emotional changes in astral body slowly manifests in our physical body. Its immediate benefit is on the heart as heart is the organ which is strictly working on rhythm. Heart beat becomes near optimum i.e. 72 B.P.M. Coronary arteries blockages, valves blockages starts dissolving. Palpitation comes under control. Other diseases such as diabetes, asthma, arthritis, gout, cholesterol etc comes under control. Normally, a person is breathing 14-15 breaths per minute. By breathing rhythmically at 12 breaths per minute, we are saving 20-25% of energy used in breathing, so we stay energetic with less hunger and sleep. With less number of breaths, we are getting more oxygen because we are using full capacity of the lung. When blood circulates in the body, it carries rhythm together with oxygen and nutrients and gives rhythm to every cell of the body. Hence, they get new life and starts vibrating with energy at right frequency and rhythm. Imagine a community of trillions of cells living in rhythm, harmony and coordination living under the control of their master i.e. the mind. A happy, healthy and prosperous life.
Those who are spiritual and believes that we are spiritual being, having human body experience and seeking spiritual enlightment and salvation (moksha), and looking for freedom from birth and death cycle should also practise rhythmic breathing. By practicing rhythmic breathing, you come in harmony with the universe. You become attuned to the rhythm of universe. You experience sense of oneness with the super consciousness, God, nature, Divine wholeness or whatever you may like to call. The soul becomes free from all emotions, which is the cause of birth and death cycle.
From my own personal experience, I feel that more research needs to be done on rhythmic breathing, especially its ability to cure heart ailments and cancers, as cancer is also caused by some body cells losing rhythm, becoming rebellious and out of control of the mind.
Related links where you can get more information:
1. Introduction to Rhythmic Breathing2. An introduction to 3 Step Rhythmic Breathing (3SRB) by Parth Sejpal
3. Stress Relief Techniques 1: Rhythmic Breathing
4. Meditate Now Making Your Breath Rhythmic
5. Rhythmic Breathing Exercise