Abstract: A quick hook-up and release toggle and a quickly separable anchor for adjustably interconnecting the anchored live and dead ends of a belt especially suited for constraining the abdominal portion of a weight lifter's torso, and the like, the belt being of substantial width and thickness. The releasable toggle is operable to instantly draw up or allow interconnected separation of the live and dead belt ends, having two operational conditions: a tightened closed condition wherein a link occupies an over-center position drawing the anchors into a predetermined position: and a released interconnected and opened condition wherein the link swings free for complete separation of the live and dead end anchors by manipulation of anchor pins from belt holes, and at least one anchor pin from hooked engagement with the belt.