EN
Attending swimming lessons has become a very popular form of spending free time. The aim of the study was to determine the influence of the author’s method of visualizing motion to change swimming technique in crawl and crawl on the back in children. 50 children have been examined and 18 boys out of this group have been qualified for a detailed analysis. The examined have been divided into two groups – an experimental group realising a training program including visualisation – and a control group realising only the training program. As a part of the test method, swimming technique of swimming crawl on the back and on the chest, was registered with digital Sony camera. Then, using “Avi Image”, values of the measured attributes were defined for both swimming techniques. These included the angle of attack and the angle of the maximum bending angle of the elbow of the right and left arm. Results has represented a valuable support of training process, finished with sports success at junior level.