I have a black strap that came with TRX and don't know what it's for. Circular. When flattened out, around 1 year. About 2 inches wide. Didn't see it in intro videos. What's it for?
Yeah, if it’s the anchor that came with my kit you use it like a slap strap and wrap it around a tree/bar and anchor to it.The door anchor is much shorter and has a black piece attached to it so it doesn't slip through the door crack if I remember correctly.