The present invention relates to a device for training triathlon and a system thereof. The device for training triathlon comprises: a first training section ( 10) including a first module for stationary swim training, a second training section (20) including a second module for stationary bike training, a third training section (30) including a third module for stationary run training; wherein said first ( 10), second (20) and third (30) training sections are joined to each other so as to form said device for training triathlon (100) having a surface area of less than 30 m2.
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