Successful performance in many sports such as roller skates, often require recognition and appropriate agility, balance and self-confi dence to various situation. To achieve a high level of profi ciency and self-confi dence, good core stability can help maximize roller skates performance. The purpose of this study was to determine the effects of core stabilization exercises on selected motor profi ciency indexes (agility and dynamic balance) and self-confi dence in girl roller skaters. This is an experimental study. The population consists of the girls roller skaters between 14-16 years of age. Based on Solomon four group design, a total of 40 girl athletes were randomly assigned into four experiment and control groups. During 8 weeks each group received its own treatment and then all groups participated in a posttest. The experimental groups received experimental treatment during the experiment. The comparison of posttests indicated that experimental treatment (core stability training) has not signifi cant effect on the balance, agility and self-confi dence of girl roller skaters. It is, therefore, could be concluded that more intensity and duration of exercises are needed if the experimental treatment effect to increase the self-confi dence, balance and agility of participants in the study.