Swimming is of the most important sports in the world and most countries try to find the most qualified people for participating in world & apos; s different championships. Training athletic people in swimming sport is more important in this area of sports compared with other sports. In this paper, we perform an empirical investigation to find the effects of various swimming sports on swimmers. The focus of this study is to compare the performance of two methods before and after two methods of interval and combined breast stroke swimming. The population of this survey includes all teenagers aged 13 and 14 who had, at least, one year of swimming experience. The sampling includes 30 people who were randomly selected and they were divided into two groups of 15 people. One group participated in interval training for three sessions per week and in an eight-week period. The second group took part in combined training for three sessions per week and in an eight-week period. At the end of training program, we have compared the results using t-student. Combined swimming includes different types of exercises. The results show that although there is a meaningful difference before and after two types of training programs but there is no different between the performances of these two tests.