Resistance exercise machine

A resistance exercise machine, comprising:

• a body, including an accommodating box extending in a longitudinal direction and two pedals respectively located at two sides of the accommodating box and extending outwardly, horizontally in a transverse direction;
• a power-driven resistance unit, fixed in the accommodating box, the power-driven resistance unit including an output shaft for transmitting power;
• a reel, connected to the output shaft and rotated along with the output shaft, the power-driven resistance unit giving a rotational resistance to the reel;
• a cable, having one end fixed to and wound on the reel and another end defined as a free end, the free end extending out of the accommodating box;
• a control unit, disposed in the accommodating box, the control unit being in signal communication with the power-driven resistance unit;
• a control knob, disposed on an outer surface of the accommodating box, the control knob being electrically connected to the control unit;
• wherein, in use, an external force is applied to the free end to pull the cable for overcoming the rotational resistance, when the external force disappears, the power-driven resistance unit reels in the cable through the reel, by turning the control knob, the rotational resistance is adjustable through the control unit.