Abstract: A device for training swimmers includes a swimsuit, one or more drag-creating strips, and fastener(s) for detachably fastening the drag-creating strip(s) to the swimsuit. Each drag-creating strip includes non-porous material forming at least one pocket having a closed bottom, closed sides and an open top. During swimming, water entering the pocket will impact against the sides and bottom of the pocket, thereby creating turbulence. Such turbulence produces resistance to the movement of the swimmer through the water. The layout and number of fasteners allows the drag-creating strip(s) to be attached to the swimsuit in any one of various orientations. Thus, the pockets can be oriented at optimal positions relative to the movement of the swimmer through the water. Moreover, the pockets can be oriented in a manner that isolates a particular muscle group for training.