Closed kinetic chain exercise device and method

A closed kinetic chain exerciser device comprising:

• a platform having an upper surface and a lower surface;
• a pivot plate connected to said lower surface;
• said pivot plate support having a length substantially equal to the distance between the front and rear edges of said platform and including a semi-circular recess therein for supporting said distal end of said pivot plate during opposite tilting movement of said platform;
• and
• a cross-member on said pivot plate support and an opening in said pivot plate for receiving said cross-member for preventing fore and aft movement of said platform with respect to said pivot plate support for preventing separation therebetween along the length thereof during tilting movement of said platform;
• first and second friction surfaces on said upper surface having a coefficient of friction greater than that of said upper surface;
• said first friction surface located on said upper surface solely on one side of said pivot plate;
• said second friction surface located on said upper surface solely on a side of said pivot plate opposite to said one side;
• said first and second friction surfaces having dimensions including a side-to-side length and a front-to-rear width that will frictionally engage the feet of a user positioned at stabilized locations on opposite sides of said pivot plate;
• said dimensions extending throughout substantially the full planar extend of said upper surface whereby said stabilized locations can be varied to produce a closed kinetic chain exercising of one of a plurality of selected lower extremity joints;
• a pivot plate support having a surface thereon for receiving said pivot plate;
• said surface and said pivot plate interacting when an unbalanced force is imposed on said platform for allowing side to side angular movement of said platform about said longitudinal axis while limiting fore and aft movement of said platform with respect to said pivot plate support.