A rowing machine is, in a nutshell, an indoor exercise machine that mimics the movement you would make when rowing a boat or canoe, allowing you to perform this action without exposure to external factors that are experienced in "Canoeing".
It consists of a seat, a support for the feet, which makes the legs semi-flexed, and has a handle or handle that is subject to a certain amount of weight, which must be raised by pulling this handle forward, to your chest, managing to generate tension in almost the entire body.