The schwinn bike ic4 is not for nothing the most widely used rowing machine. Professional athletes from all kinds of sports train on this rowing machine and rely on the technology that is processed in this device. Crossfit rowing machines are also almost always Concept2 machines. This machine really leaves nothing to be desired. At https://concept2-test.com you can see the 3 different models which differ mainly by the https://thebestoakville.com stats and the monitor (PM4 = new model, PM3 = old model) and the different seat height.