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The research aimed at :<br /> 1. Recognizing the values of some biokinetics variables of the arm from inside water in the 25 m butterfly swimming .<br /> 2. Recognizing the values of some anthropometric measurement .<br /> 3. Finding the relationship between the values of some biokinetics variables of the arm from inside water with arm length in the 25 m butterfly swimming .<br /> The descriptive method was used . the sample included ( 5 ) swimmers of the senior group of Nineveh team . the technical scientific observation , analysis and measurements were used as means to collect the data to obtain some of the biokinematics variables values and some anthropometric measurements values , to achieve the technical scientific observation accurately , the videography was used . the study included a number of biokinematics variables of the arm and anthropoetric measurements . the data have been processed statistically by using the mean , standard deviation and simple correlation .<br /> the researchers concluded the following :<br /> There Were no significant correlations between some biokinetics variables values of the arm from inside water with arm length .<br /> The researchers recommended some recommendations to be utilized in the learning and coaching to get the best performance .<br /> * Keywords: Bio kinetics- anthropometric measurement- swimming-25 m butterfly