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Purpose: The purpose is to examine the influence of changes in body components due to the movement of core muscles on the unstable support surface and the stable support surface. Methods: The study consisted of 12 healthy adults. Two groups were randomly selected. The flank and bridge exercises were carried out on the unstable support surface and the stable support surface. Body-X balance tool was used to create an unstable support surface. The exercise intensity and time were progressively increased every week. Results: There was a significant difference in body weight of the group using the stable support surface (p<.05). However, there was no significant difference elsewhere. There was no significant difference in body weight, fat mass and skeletal muscle mass of the group using the unstable support surface (p>.05). There was a significant difference in body weight between the groups (p<.05). However, there was no significant difference in body fat mass and skeletal muscle mass between the two groups. Conclusion: According to the results, significant differences were found only in body weight after performing exercises on stable support ground while there was no significant differences in body weight, fat mass and skeletal muscle mass on unstable support. Although there was no significant changes in the body composition after conducting interventions, a decrease trend of body weight was found. Therefore, it will be necessary to study with more than three-week intervention periods in the future studies, related to core exercise and body composition.