Arm and leg compound exercise machine

An arm and leg compound exercise machine, comprising:

• a base, disposed on a horizontal ground;
• a transmission device, installed onto the base, and including a pulley;
• a pair of crank units capable of adjusting a crank length, including a pair of fixed casings and a pair of adjusting blocks, and the pairs of fixed casings being rotationally installed to both sides of an axle of the pulley of the transmission device, and the axle of the pulley being used as a central axis point, and the adjusting block having a crank length from the central axis point and a connection bar extended from the adjusting block;
• a motion unit, including two hollow swing arms, two sliding sets, two hinged frames, and two foot pedals installed on both sides of the base, and a pivot seat disposed on the hinged frame being rotationally and pivotally coupled to a connection bar of the crank unit disposed on the transmission unit, and the hollow swing arm having a lower end pivotally coupled to a sliding set, and the pivot point acting as a rotating shaft point, and the sliding set having a foot pedal disposed at an end of the sliding set and disposed beyond the range of connecting the central axis point and the rotating shaft point at the lower end of the hollow swing arm, and the arc slide bar of the sliding set being disposed and sliding in a receiving space between the hinged frame and a roller installed therein, and a distance existing between the roller and the pivot seat, so that the sliding set and the connection bar of the crank unit have different axle points, and when the foot pedal is operated to drive the crank unit to rotate, the motion path produced by the roller on the hinged frame is a non-circular motion track;
• when a user steps on the foot pedal of the arm and leg compound exercise machine for operation, the motion path produced by the foot pedal acts as a motion track, and the motion track produced by the foot pedal is an elliptic motion path, and the elliptic motion path is flat and gentle at the top and arc shaped at the bottom, so that the motion track produced by the user's stepping movement is ergonomic to prevent sports injuries.