The evolution of human species has always involved one thing – competitiveness. Humans have fulfilled their urge to compete with all kinds of sports and physical activities. From a vast number of competitive activities, in the beginning of the 20th century emerged those that included diving. Finswimming, as one of those diving activities, became the biggest diving sport in the world. The main objective of this thesis is to show, for the first time ever, the regularity of the evolution of the results in world, European and domestic competitions, analysing group results from world, European and domestic tables results in individual races. Swimmers that competed in the final races in World, European and Croatian championships from 1969 to 2018 were used as sample. Variables in this thesis were 50m bifin (BF), 400m surface finswimming (SF) and 400m immersion (IM). Those variables were chosen as they represent the 3 main types of finswimming. Data used in the thesis was collected in the form of official results published on the official website of the World Underwater Federation (CMAS) and official bulletins obtained from the Croatian Diving Federation (HRS). For the analysed races single-dimensional changes in the state of swimmers through the years were shown by linear regression, if through time there was a change registered in one of the quantitative variables. Polynomial regression analysis was used to process the trend of development of the mean of final results and the outcome was a simple linear relation. Therefore, there was no need to use higher order functions because the sport itself is too young for complex studies. A detailed insight in this topic gave the opportunity for a more specific planning, programming and implementation of the training process.