Personally, I am not a huge fan of cardio machine. This is not because I think that cardio is without benefits, but because so often heard the miss-concept about being lean, that the only way to get you lean / slim is by doing endless cardio and there is absolutely no point doing weight training when you weigh so much until you trim it down.
Still, after doing endless cardio, some people are still not losing weight and got stressed out and say good bye to the gym and back to the ‘junk’ lifecycle that they used to have. If you are not sure whether your cardio routine is up to scratch, then it’s probably not. And if you can’t understand why the weight simply won’t shift despite all the time and effort you put in, then it’s safe bet that you are stuck in a faulty cardio routine.