US Games Push-Up Challenger- Pack of 12 Elevated block is placed under the user's chin to keep each push-up consistent Encourages students to keep arms at a 90' angle as they bring their chin down to the block Stacking design makes it easy to store the testers in your classroom Use to teach and test the mechanics of a correct push-up The push-up tester is now being used by many for Presidential and Fitnessgram tests