Disclosed is a swim trainer using a laterally displaceable torso support pad and two cables interconnecting the swimmer's opposite hands and feet: right hand with left foot, left hand with right foot. It incorporates tension physics with applied tension force displacement wherein the torso is supported with two degrees of motion, i.e., hinged front-to-back tilt and left-to-right displacement of the torso. The user's opposite hands and feet are interconnected by cables passing through pulleys located below the torso. As the user performs a simulated swim stroke, force is asserted on the cable ends, moving the entire body to the right or left along a defined lateral displacement path. The user controls the swimming stroke speed, therefore controlling the amount of resistance applied between hands and feet based on the lateral motion torso speed against torso weight pressing down on the central support.