The purpose of this study was to develop and validate the Observational System for the Proxemic Communication of the Fitness Instructor, as well as conduct a pilot application of the same. During the development and validation process of the new observation system it was employed five sequential phases. At the end of this process, it was established the validity and reliability of 5 coding dimensions and 23 categories of instructor proxemics behavior to create the final version of the observational system. This version of the observational system was applied in a pilot study conducted in a sample of 12 fitness instructors from four different group-exercise classes. The results indicated that instructor proxemics behaviour could be feasibly coded with the Observational System for the Proxemic Communication of the Fitness Instructor, having been held a comparative analysis about its intervention in the various activities, albeit with a small sample size.