System and method of isometric exercise

An isometric training device comprising:

• a rotatable and lockable spool configured to contain a wrapped strap, the spool having a side walls and a central axis;
• a pair of elongated bars attached to the spool and extending outward from the central axis on each side, the elongated bars constructed to attach the device to a fixed surface;
• a continuous folded double strap wrappable on said spool, the spool and the double strap co-operating to provide a strap loop of strap length adjustable by a user;
• wherein the device includes first and second outer walls fixedly mounted concentrically on said bars with the spool being rotatably mounted concentrically on the bars between the first and second outer walls;
• a spring-biased retractable locking pin retractably attached to one of the outer walls that passes through a hole that outer wall;
• and,
• wherein each side wall of the spool has three concentric holes adapted to receive the spring biased retractable locking pin;
• said retractable locking pin having an engaged position, wherein it passes through into one of the concentric locking holes preventing the spool from rotating, and a retracted position, wherein it clears all three of the plurality of concentric locking holes allowing the spool to rotate.

A method for providing an isometric training device comprising:

• providing a rotatable and lockable spool configured to contain a wrapped strap, the spool having a side walls and a central axis;
• providing a pair of elongated bars attached to the spool and extending outward from the central axis on each side, the elongated bars constructed to attach the device to a fixed surface;
• providing a continuous folded double strap wrappable on said spool, the spool and the double strap co-operating to provide a strap loop of strap length adjustable by a user;
• wherein the device includes first and second outer walls fixedly mounted concentrically on said bars with the spool being rotatably mounted concentrically on the bars between the first and second outer walls;
• providing a spring-biased retractable locking pin retractably attached to one of the outer walls that passes through a hole that outer wall;
• wherein each side wall of the spool has a plurality of concentric holes adapted to receive the spring biased retractable locking pin;
• said retractable locking pin having an engaged position, wherein it passes through into one of the plurality of concentric locking holes preventing the spool from rotating, and a retracted position, wherein it clears all of the plurality of concentric locking holes allowing the spool to rotate.