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Abstract: An apparatus was made by connecting the switch of a round springboard to a timer. 17 excellent gymnasts of national-level and 20 gym-beg-inners (all children) jumped at the same spot repeatedly. With thisapparetus, the accuracy and duration in the reproduction of his or herjumps, the symmetry of the turns both to the right and to the left, thetransfer and interruption of the reproduced stay above duration, the rhyth-ms of movements, the errors in duration, distance and angle when thebody turns 90 quickly and slowly are tested. According to a formula thetime and space index of each of the tested gymnasts are found. Amongthe many factors which can be used to analyse a gymnast's ability of selfcontrol over the opportune moment, it is important to determine whichare potential factors and which are factors acquired through learning andtraining, and how can these two kinds of factors develop coordinately.With this knowledge, gymnasts can be helped to build up and developtheir ability of self-control over the opportune moment.

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