Abstract: A variable resistance device for use in training a swimmer includes an L-shaped scoop member, a belt and a surface area varying mechanism. The L-shaped scoop member is formed out of a relatively non-reflexible sheet of plastic material and has a support portion and resistance portion. The support portion is substantially a truncated triangle with a top edge and a bottom edge. The resistance portion is substantially a rectangle with a flat surface area, a first edge and a second edge which is contiguous with the bottom edge of the support portion. The resistance portion has a rectangular slot of a first cross-section. The belt is detachably coupled to the swimmer's torso and is hingedly coupled to the support portion of the L-shaped scoop member adjacent to the top edge thereof. The L-shaped scoop member is pivotally coupled to the belt in order not to interfere with the swimmer's stroke. The surface area varying mechanism includes a sliding member, two mounts and a securing mechanism.