Climbing exercise machine

A climbing exercise machine, comprising:

• a base support frame, configured to contact a floor or ground surface;
• a lower upright, wherein a lower end of the lower upright is rigidly connected to the base support frame at an obtuse angle;
• a crossbar, wherein an upper end of the lower upright is rigidly connected to a middle, central, or intermediate portion of the crossbar;
• an upper left upright, wherein a left end of the crossbar is rigidly connected to a lower end of the upper left upright and the lower upright and upper left upright are in substantially parallel planes respectively aligned with the middle, central, or intermediate portion of the crossbar and the left end of the crossbar;
• an upper right upright, wherein a right end of the crossbar is rigidly connected to a lower end of the upper right upright and the lower upright and upper right upright are in substantially parallel planes respectively aligned with the middle, central, or intermediate portion of the crossbar and the right end of the crossbar;
• a resistance motor comprising a resistance motor axle and housed partially within the crossbar and partially within the lower upright at a junction of the crossbar and the lower upright;
• first, second, third, and fourth rails, wherein the first and second rails are housed within the lower upright, wherein the third rail is housed within the upper left upright, and wherein the fourth rail is housed within the upper right upright;
• first, second, third, and fourth slides, each slide being supported on a corresponding rail such that each slide can slide along the corresponding rail to create a linear reciprocating motion;
• a first foot pedal operatively connected to the first slide;
• a second foot pedal operatively connected to the second slide;
• a first handle operatively connected to the third slide;
• a second handle operatively connected to the fourth slide;
• a first linkage assembly, interconnecting the first handle, the first foot pedal, and the resistance motor;
• a second linkage assembly, interconnecting the second handle, the second foot pedal, and the resistance motor;
• a third linkage assembly, interconnecting the first foot pedal and the second foot pedal;
• and
• a fourth linkage assembly, interconnecting the first handle and the second handle,
• wherein the interconnections provided by the first, second, third, and fourth linkage assemblies synchronize a reciprocating concurrent motion of the first foot pedal, the second foot pedal, the first handle, and the second handle to simulate a continuous climbing exercise motion for a user, and
• wherein, due to the interconnections provided by the first and second linkage assemblies, the reciprocating concurrent motion causes rotation of the resistance motor axle to activate the resistance motor during operation of the climbing exercise machine.