Dramatically strengthen your upper body with the Lifeline Gym power push-up. This device increases resistance on your push ups by up to 80%, They are simple to use, carry anywhere and workout anytime. Because of increased resistance now gain size & strength from the Push up, Beginners can work off the knees or off the wall, Add 20, 40, or 60 lbs. to your push ups, dips, rear delt. flys, squats, & more! Or use two at one time for up to 120 lbs. to build incredible muscle size & strength.Measures 22 inches in length. Includes full instructional manual written and developed by Jon Hinds CSCS, CPT.