The bike is potentially awesome exercise. And it's low impact nature can be a good change-up from higher impact exercise, or for those with joint issues.
But I agree that they key is resistance. You can cruise along at a fairly high speed and still not burn all that many calories at a low level of resistance. But as you increase the resistance, you can really increase the work required, and give yourself an awesome workout.
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.
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