I am skeptical of the 450 figure.
Most people burn between 6-10 calories per minute on a sustained basis. A fit person really pushing themselves might burn 12-13 per minute. But the figure of 15 per minute that the arc trainer is giving you doesn't really sound plausible. As Coach Jen said, many pieces of exercise equipment are notorious for overinflating calorie estimates.
If your heart rate is higher on the stair climber, then that is what is burning more calories.
In any event, mixing things up by cross-training with different types of exercise is better for you than doing just the same thing all the time.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
| current weight: 178.0