Life Fitness Signature Series Multi-Jungle MJ4The Signature Series MJ4 is a multi faceted piece of equipment that can be customized with various add ons, configurations and setups to provide exercisers with nearly limitless workout variety. Allowing up to five exercisers at once, the MJ4 is perfect for group training. Cable Motion Technology employs user defined paths of motion that allow for a nearly endless variety of strength training options that builds balance, stability, and power.