I know, I know, only doing 10 minutes of cardio sounds puny, but let me tell you at the end of the time I am sucking air big time. Now everyone else at the gym rides the machines for 30-40 + minutes and they don't reach near the intensity that I do in 10. It is a bit embarrassing when I sprint, but I think this method is doing me a whole lot of good as opposed to riding "gently" for an hour!