In this study it has been assumed, that the value of forces generated in time function (impulse) during the downward and upward phases of dolphin kicking, can be treated as a quantitative measure of the dolphin-kick propulsion effect. In the presented context, there is evidence that especially in upward dolphin kicking, the ability for kinesthetic control of the propulsive forces generation, as a qualitative measure of the dolphin-kick propulsion effect, can improve the dolphin kicking performance. Therefore, apart from analysis of the process of propulsive forces generation in butterfly swimming technique (BS) or dolphin kick only (LK), direct diagnosis of controlling activation of upward kick (AUK), will be taken into consideration. The aim of this study was to analyze the process of the propulsive forces production as a result of upward and downward dolphin leg movements. It was hypothesized that skilled butterfly swimmers are able to kinesthetically control their movement during upward kicking and this way they can learn how to use this phase to improve their performance.
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