The purpose of this paper was to clarify the existence of an ideal language of instruction (<teaching language>) based on the author’s own experiences. In the case study experienced by the author, the instructor used several words when trying to get the athletes to learn sports techniques. The author was intrigued by the variety of expressions used to improve certain movement actions, but also wondered what words the best words for athletes could be. Based on the example above, I attempted to examine the existence of <teaching language> relying on Frege’s theory. Specifically, I have attempted to describe how each of the cases is expressed, both when the existence of <teaching language> as the sole “Sinn” is posed and when it is not. From the consideration of this paper, it is considered that there is a <teaching language> as the sole “Sinn” to indicate the object that can be directly indicated, such as the object pointed to by the scientific language. However, it was submitted that the words do not necessarily lead to “I want you to move like this”. Based on this, I focused on “Vorstellung”, which is an internal image that everyone can generate for a sensory perceivable object. As a result, the view that the common part of “Vorstellung” is an element of <teaching language> was presented.