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I got this from BeachBody Fitness with the purchase of one of their dvd sets. You can buy them on the beachbody site for a few bucks but can also get them at any fitness store. It is about 5 feet long and is stretchy just like a big rubber band. I thought this would break after a couple uses but it is really strong. You can use it for stretching or for building muscles depending on what moves you do. I have been using mine with TurboFire and it is working really well to make me more flexible and also build muscle.
Pic is mine.