In order for any sporting activity to be conducted effectively, the technique of the respective sport must be known. The "effective" technique is not an abstract and general concept, but rather the way movements are executed so that the forces exerted, e.g., for propelling the body, are applied in the most effective manner possible and with the least amount of energy expenditure.

In swimming, as water, due to its greater density compared to air, "maximizes" the "mistakes" and resistances that hinder the movements and propulsion of swimmers, the "correct" technique is a far more decisive factor in achieving high performance and avoiding injuries, compared to all other sports.

Although each swimmer has their individual peculiarities and consequently there is no "perfect" technique for everyone, there are some "rules" and "criteria" for the "correct" and "effective" technique of swimming styles. This is precisely the subject of this book, which attempts to present and analyze the technique of the four swimming styles (freestyle, backstroke, butterfly, breaststroke) and the corresponding turns and starts, emphasizing the "image," through many diagrams, and the understanding of the "nature" of the resistance forces and the propulsive forces that develop during movement in the water.

In the daily effort to "perfect" technique, it is particularly important for swimmers to "visualize" their movements and to gain the "sense" of the water. By understanding the properties of water, they can exploit them to the fullest extent, achieving not only better competitive performances but simultaneously preventing possible injuries due to poor technique.

Gourgoulis Vasileios
Professor of Physical Education and Sport Science - Democritus University of Thrace.