Core bodywork uses mysofascial and structural somatic therapy, promoted by George P. Kousaleos, an internationally renowned practitioner and teacher of structural integration. There are four phases of core body therapy, organized according to the level or layer of fascia, musculature and supporting soft tissues that are manipulated. They are: core massage, core extrinsic, core intrinsic and core integration. Core massage is taught to licensed or nationally certified massage therapists.