Get a Great Workout with a Doorway Chin Up Bar Before you begin using your doorway chin up bar, you should always do a quick fifteen minute warm up beforehand. This will ensure you get your muscles ready and prevent any injury from occurring. A light warm up is all that is needed to get ready for the in Public bookmarkswith doorway_chin_up_barfree_standing_chin_up_barwall_mounted_pull_up_bar Note: Before you begin using your doorway chin up bar, you should always do a quick fifteen minute warm up beforehand. This will ensure you get your muscles ready and prevent any injury from occurring. A light warm up is all that is needed to get ready for the