Somatics is a field within bodywork and movement studies which emphasizes internal physical perception and experience. The term is used in movement therapy to signify approaches based on the soma, or "the body as perceived from within", including Skinner Releasing Technique, Alexander technique, the Feldenkrais Method, and Rolfing Structural Integration. In dance, the term refers to techniques based on the dancer's internal sensation, in contrast with "performative techniques", such as ballet or modern dance, which emphasize the external observation of movement by an audience. Somatic techniques may be used in bodywork, psychotherapy, dance, or spiritual practices. An early precursor of the somatic movement in Western culture was the 19th-century physical culture movement. This movement sought to integrate movement practices, or "gymnastics", related to military and athletic training; medical treatment; and dance. Many physical culture practices were brought to the US. One particular American innovator, Genevieve Stebbins, developed her own physical culture system. Some of Stebbins's many followers returned to Europe; one of these trained Elsa Gindler, who is recognized as one of the earliest somatic innovators. Many further foundational developments in somatics have been traced to the turn of the twentieth century. At that time, the increased popularity of phenomenology and existentialism in philosophy led philosophers such as John Dewey and Rudolf Steiner to advocate experiential learning. Meanwhile, choreographers such as Isadora Duncan, Rudolf von Laban, and Margaret H'Doubler challenged traditional European conceptions of dance, introducing newly expressive and open-ended movement paradigms. Together, these movements set the stage for the first generation of "somatic pioneers", which included Frederick Matthias Alexander, Moshe Feldenkrais, Mabel Elsworth Todd, Gerda Alexander, Ida Rolf, Milton Trager, Irmgard Bartenieff, and Charlotte Selver. These pioneers were active, primarily in Europe, throughout the early twentieth century.