What is Thai Massage? In fact, the history of Thai massage is more complex than this legend of a single founder would suggest. What to expect during the massage? The massage recipient changes into loose, comfortable clothes and lies on a mat or firm mattress on the floor. It can be done solo or in a group of a dozen or so patients in the same large room. The receiver may be positioned in a variety of yoga-like positions during the course of the massage, but deep static and rhythmic pressures form the core of the massage.