Stepping and waist-twisting exerciser

A stepping and waist-twisting exerciser, comprising:

• a) a base frame with a central post near the middle part thereof, the central post connecting one side of the base frame to another side of the base frame;
• b) a handle bar pivotally disposed on the base frame, and a lateral bevel gear positioned on a central portion of the central post for imparting a left-and-right swing motion to said handlebar;
• c) a handle transmission shaft, and two longitudinal bevel gears facing to each other and each longitudinal bevel gear rotatably disposed at the top of the central post by use of a mounting shaft so as to be engaged perpendicularly with the lateral bevel gear;
• and
• d) two rear parallel connecting rods, each rear parallel connecting rod movably attached at one end thereof to one of two corresponding coupling footboards and attached at the other end thereof to one of two of said longitudinal bevel gears to ensure a coordinated movement;
• wherein, in stepping on any one of the coupling footboards, a corresponding longitudinal gear, disposed below the coupling footboard that was stepped on, will be rotated such that the lateral bevel gear is brought in rotation in opposite direction;
• in this way, an expected rotation is imparted to the handlebar;
• and
• wherein the movement of the longitudinal bevel gears enables an a rotation of the two corresponding coupling footboards so that the coupling footboards and the handlebar are brought in opposite rotation about a vertical axis.