A training device for competitive swimmers in the form of a drag suit adapted to be worn over the swimmer's regular suit. The drag suit adds weight and increases the resistance (drag) to the swimmer's movement through the water and thus helps in the development of the swimming muscles. The increased drag is caused by a plurality of pockets on the front and back of the suit which pockets open in the direction of the swimmer's movement through the water. Water entering the pockets is impeded in flowing through them whereby the drag is created. The pockets are located on the suit in such a manner that the drag is distributed evenly on the swimmer with no imbalance tending to cause the swimmer to roll or dip.
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