from the manufacturer
theraband door anchor
the theraband door anchor is well matched with resistance bands and tubing for a variety of different exercising and sporting events. The smooth-to-use door anchor easily attaches to resistance bands and tubing for higher and decrease body exercise. The door anchor is located inside the door jam and can be moved to any height imparting a versatile and kind of exercise. The door anchor is made of a nylon adjustable strap that securely attaches to door jam throughout use.
anchors a theraband tube or theraband to a door, growing a small exercising station anyplace you move