Jacobs LadderJacobs Ladder provides the most efficient exercise for those serious about conditioning. Unlike most cardio machines, this patented treadmill climber utilizes low impact, high range of motion exercise to provide a superior cardio workout to both the upper and lower body. Jacobs Ladder is an innovative cardio machine with ladder type rungs on a non motorized continuous treadmill. Its self paced, so the faster you go, the faster it goes. Jacobs Ladder