摘要:The present study aims to verify developing strength and endurance to improve performance in swimming competitions. One of the is to increase the general motor skills to the ascertaining sample taken by us in investigations. My purpose on this research, is to define how the performance will improve by this form of training. The framework of the research is to improve the combined motor and speed qualities by swimming against the current of the water. The development of the strength and endurance, swimming against the current, requires the swimmer’s rigor and seriousness in forming their lifelong sport’s activity. Methods. In the research activity we used the following research methods: method of sources of specialized and interdisciplinary literature, method of pedagogical observation, method of tests and control tests by measurement and evaluation, mathematical-statistical methodology, comparative method, graphic and tabular method and method of analysis and interpretation of results. The duration of the research was 6 months, the control samples used are 50 m free and 200 m mixed. Results. The results of the tests performed were recorded in tables and represented graphically. The results obtained at the first test gradually increase, thus reaching the highest values at the third test. Conclusions. At the end of the experiment it was found that the most significant evolution was recorded in the 200 m medley race, compared to the 50 m freestyle. The competition resulting from the large number of clubs with swimming sections, as well as every swimmer’s desire to get a noticeable performance, oblige the teams to a serious training, the coaches being forced to find training methods and means that would propel the athlete swimmers to first places.