I currently spend 60mins on the eliptical during workout and non workout days. I try to keep my Heart rate between 155 and 165....lately been avg 150-155. Friend of mine told me that for fat loss, which Is my current goal, that I need to keep my heart rate around 130/135. The metaphor he used was this: Heartrate on a cardio level causes you to burn your carbs. Keeping it lower burns fat. Imagine yourself in a desert, you will walk slow to escape it and burn off all your fat reserves. I kinda understand, but maybe it wasn't the besy explanation FOR ME. I'm 212lbs 5'7" and 27%bf. I've already got my diet worked on, but am wanting to know if I should change my cardio routine?