A swim training system 1 comprises a training device 100 and a processing device 200; the training device 100 measures a tension in a connecting component 111 which is fastened to a swimmer; the processing device 200 selects a conversion parameter from a conversion parameter table in the processing device according to swimmer information; the processing device obtains exercise information according to the measured tension and the conversion parameter. The exercise information may be swimming speed, average swimming speed, distance or calorie expenditure and may including timing information. A swim data computation method and swim training method using the apparatus are also disclosed.
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