A collapsible exercise stepper comprising:
- a base, a movable extension rack, a grip assembly, two stepping units, two hydraulic cylinders, and a folding unit;
- the base including a first fixing rod and a first connection rod connected on the first fixing rod, the first fixing rod having a first coupling portion extending from a bottom thereof, the first connection rod having a first connector extending from a first side thereof, and the first connection rod having a second connector extending from a second side thereof opposite to the first side of the first connection rod;
- the movable extension rack including a second fixing rod and a second connection rod connected on the second fixing rod, the second fixing rod having a second coupling portion and two extending tabs adjacent to the two ends of the second fixing rod individually, the second connection rod having a horizontal bar inserted through a lower end thereof and a third coupling portion arranged on an upper end of the second connection rod, wherein the third coupling portion is rotatably connected with the first connector by way of a first bolt element so that the movable extension rack is rotatably coupled on the base;
- the grip assembly rotatably connected with and erected on a top of the base so as to be held by user's hands, the grip assembly including a handle and a fitting tube on which the handle is mounted, the grip assembly including an accommodation portion and an actuation seat, wherein the handle is accommodated in the accommodation portion, and the actuation seat is rotatably connected with the second connector by using a second bolt element so that the grip assembly is rotatably retracted relative to the base;
- each of the two stepping units including a support plate and a pedal, the support plate having a rotation portion formed on a front end thereof and rotatably connected with the horizontal bar of the movable extension rack, the pedal being disposed on the support plate, and the support plate having a driving portion coupling with each of the two hydraulic cylinders;
- each of the two hydraulic cylinders including a first joining portion and a second joining portion opposite to the first joining portion, the first joining portion being rotatably connected with the two extending tabs of the movable extension rack, and the second joining portion being rotatably coupled with the driving portion of the support plate;
- and
- the folding unit including a first operation element and a second operation element, wherein the first operation element is rotatably joined with the first coupling portion of the first fixing rod, and the second operation element is rotatably joined with the second coupling portion of the second fixing rod, such that an expansion angle and an extending distance between the base and the movable extension rack are limited.