This paper shows how mixed swimming is one of the most demanding and complex swimming disciplines, which requires a high level of mastery of all four swimming techniques. The aim of this work is to analyze mixed swimming throughout history, to show the specifics of the anthropological status of swimmers who swim in mixed swimming, and to refer to the technical and tactical specifics of mixed swimming. Successful swimming requires a specific body type: swimmers are tall, with long limbs and large feet/palms. Analyzing the morphological features of top swimmers in the mixed style, they are identical to those of other techniques. Motor characteristics that are important for success in mixed swimming are explosive power, speed, repetitive power, and a very high degree of flexibility and mobility. In addition, a high level of oxygen intake is crucial for success in medley swimming. The tactical component of medley swimming is perhaps the most complex of all swimming disciplines, because all techniques are interwoven through one discipline. The specifics of physical preparation for mixed swimming are manifested through work in the water, because it is necessary to work on the development of all 4 swimming techniques. For success in medley swimming, it is necessary to satisfy a whole series of factors in order to achieve top results, which leads us to the conclusion that medley swimming is the most complex swimming discipline.