PuttOut Pressure Putt TrainerInvented in London, Great Britain by product designer Martin Riddiford, the PuttOut was developed using drills the Pro's use to build confidence to achieve the perfect putt. Parabolic Putting. PuttOut is a scientifically shaped target which rejects bad putts and returns good ones. PuttOut's revolutionary training aid will improve your aim and pace with its scientifically designed parabolic curve that auto returns your good putts, rejects missed putts