Abstract: A safety dyna-bender is disclosed having a center cord with considerable flexibility and proper length installed in the hollow section of a dyna-bender through the coupling of a pair of cup-shape positioning anchors, which are respectively disposed at each end of the handle pipes rigidly connected to the steel spring coil thereof. The arrangement of the center cord and the cup-shape positioning anchors within the structure of the dyna-bender provides a safety assurance in protecting the user against any unexpected accidents resulting from either the breaking of the steel spring coil or the sudden loose of the handle pipe of the dyna-bender during exercise.