This paper presents changes related to subcutaneous fat tissue and body composition analysis using electro-muscle stimulation during a 10-month training process with one participant. Although the participant measured themselves daily before each training session, for the purposes of this study, we used only the differences between the initial and final measurements of the ten-month process. The participant received proper guidelines for a healthier lifestyle and was provided with a proper diet, but there was no insight into whether and to what extent the participant adhered to these guidelines. The training sessions were held three times a week for 30 minutes, and the training process included electro-muscle stimulation while simultaneously walking on a treadmill. Based on previous research, the hypothesis H1 was established, stating that there is a significant difference between the initial and final measurements of the participant in the body composition assessment data. Since it was found that the differences between the initial and final measurements were not normally distributed, a non-parametric Wilcoxon test was used. This method of data processing was expected, given that the data pertained to only one person at two time points, as well as the borderline significance of the differences. However, the results indicated significant absolute changes in the one participant. This study aimed to highlight the need for more detailed assessments of the effects of the EMS method on fat tissue and other important parameters of basic body components measured by a Tanita scale. Although the results of this research are interesting and show significant absolute changes in one participant, given that it is a case study, there are numerous limitations, such as the absence of a control group, the subjectivity of the measurements, the short-term monitoring framework, individual variability, and so on, making it difficult to draw general conclusions from this case. Nevertheless, considering the substantial difference in absolute changes, this research could serve as a starting point for future studies with a larger number of participants, which would allow for more reliable interpretation of the results.