The Royal Chin Up is a great way to build necessary muscles and even show off your skills. It is fashioned with two powder-coat painted steel bars that can accommodate two exercisers at once. The pull-up action works out a variety of important muscles like the biceps brachii, the latissimus dorsi, and the teres major. This unit is made of commercial grade materials that will resist inclement weather for a long time. An instructional guide is built onto the structure that shows detailed instructions on how to use this unit to its potential. The Royal Chin Up is also made with rotationally molded plastic that holds steel posts in place; protecting your investment for longer. Made fro teenagers and older to enjoy. This fitness system will get your core tight, arms large and your back toned. Bring on the beach.