Main Article Content
The circuit training model is one of the effective training models in improving the physical abilities of an athlete. The purpose of this study was whether circuit training with fixed and decreasing rest intervals had an effect on the ability of the dominant physical component in female volleyball athletes. This type of research is quantitative research with a quasi-experimental approach. The population in this study were all female volleyball players of the Baja 78 volleyball club, then taken based on purposive sampling technique and used as subjects in this study, then the size of the sample was determined by the population and taken according to the characteristics determined by the researcher, namely: 1 ). Female gender, 2). Age 15 – 23 years, 3). Physically and mentally healthy. 4). Volleyball athletes in this study had to train for at least 1 year. This research was conducted at the Bantul Regional Government Volleyball Hall and the Bantul District Square. The time of this research was carried out for two months, namely between July - September 2018 with a frequency of training three times a week, so it can be seen that the implementation of this treatment was carried out 24 times face to face. The collection technique in this study is a test and observation technique. The instruments in this study were test and non-test instruments. The analysis technique in this research is quantitative. The statistic used is t test. The results showed that there was an increase in strength, muscle endurance, speed, flexibility, power, agility, and cardiovascular endurance between before and after circuit training treatment with fixed rest intervals. Then the researchers concluded that circuit training with fixed rest intervals in general had an effect on the dominant physical component.