High Intensity Interval Training. It basically burns fat off more effectively, almost exclusively by not allowing the body to go into "idle" mode. If you do the stairclimber for 45 minutes at the same level, your body will adapt and build endurance to sustain long expenditures of energy. Which means the body gets out of fat burning mode and idles.
But, if you change the resistance every 1-2 minutes, the body constantly burns off fat because your working harder every minute. You increase intensity in 5 intervals or so. It's fkn exhausting, but it works, and you do it for 20 minutes instead of 45. Short intense cardio. It's like working out hard or not. You wont see results if you take it easy.