Despite the borderline changes that occurred in the thickness of the Transverse abdominis muscle when contracted in Vasseljen and Fladmark’s study, in the present study, the thicknesses of the Transverse abdominis and multifidus muscles when contracted increased in some of the outcomes. In our study, the exercise types were different from those used in Vasseljen and Fladmark’s study. The results of this study regarding the changes in resting thickness of the Transverse abdominis muscles following application of stabilization exercises were consistent with the study by Akbari et al. They showed an increase in resting thickness of the Transverse abdominis and multifidus muscles following the application of stabilization exercises. In the present study, the resting thickness of the left Transverse abdominis increased.