Hand paddles are the perfect tools to stengthen your upper body and improve your stroke in the water. The longer the paddle the more resistance. You should choose a paddle that is slightly larger than the size of your hand and then gradually build up to larger paddles to prevent shoulder strain. Many paddles have shapes and contours that improve your feel in the water and encourange better hand and arm positioning. Triathlete Sports has the gear to improve your swim stroke, strengthen your upper body and increase your swim speed.