Now you can get your full TRX workout anywhere there’s a door. The Door Anchor’s nylon, high-density foam, and felt system slips easily over the top of any solid wood or metal door and, when the door is shut, offers 100% sturdy support. It won’t scratch or damage paint or wood, and it folds up for easy storage and portability. And there’s a handy “Workout In Progress” safety placard included; just hang it on the outside of the door.