Attend a seminar and learn Chiropractic Respiratory Techniques created by Raphael Rettner, DC, in person at the Life West Chiropractic College West in Hayward, CA. Over 20 million Americans suffer from Asthma and Sleep Apnea. CRT is an effective way to release the structural causes of restrictions in the respiratory system, in order to improve breathing, sleep, and energy naturally, without drugs or surgery.