Mountable resistance exercise device

A portable exercise device comprising:

• a. a rigid enclosure having an outer wall that defines an internal space therein, the rigid enclosure including a first cable aperture and a second cable aperture, a preset resistance setting adjuster on an exterior surface of said rigid enclosure, an electronic command circuit board within said internal space, a motor also within said internal space, and a source of power to provide power to the electronic command circuit board;
• b. a shaft rotatably affixed within said rigid enclosure, both a first spool and a second spool, separate from the first spool, affixed around said shaft and rotatable when said shaft rotates, a first flange affixed to said shaft and positioned to one side of said first spool, a second flange affixed to said shaft and positioned between and separating the first spool from the second spool, a third flange affixed to said shaft and located on a side of the second spool remote from said first flange, whereby the first and second flanges are respectively on opposite sides of the first spool and the second and third flanges are respectively on opposite sides of the second spool, wherein each of the first flange, the second flange and the third flange rotate when said shaft and said first spool and said second spool rotate;
• c. a first cable wrapped around said first spool and extending through the first cable aperture and affixed at a distal end to a first grip element, a second cable wrapped around said second spool and extending through the second cable aperture and affixed at a distal end to a second grip element, pulling on each of said first cable and said second cable via the first and second grip elements, respectively, causes said shaft, said first spool, said second spool, said first flange, said second flange, and said third flange to rotate in a first direction;
• d. a sensor target affixed to and rotatable with a rotatable member selected from a group consisting of said shaft and at least one of said first flange, said second flange, and said third flange;
• and
• e. a proximity sensor in visual communication with said sensor target, said proximity sensor detects rotation of said sensor target and upon detection of the rotation of said sensor target, said proximity sensor transmits a first signal to said electronic command circuit board which transmits a second signal to said motor which creates a preset resistance setting on said shaft which provides a preset resistance to each of said first cable and said second cable when each respective cable is unwound from each respective spool.