A quick reality check for any calorie burn estimate is that most people burn between 6 and 10 calories per minute working out on a sustained basis. Someone who is pretty fit and pushing themselves might burn 12-13 cal/min. 250 is well within the normal range, but 55 is not.
I just tried Spark's fitness tracker for stationary biking, and it is giving me way more than 55 calories for 36 minutes of exercise. Did you record your last weigh-in correctly (Spark uses this in coming up with calorie estimates).
Also, working up a sweat is more an indicator of environmental conditions than workout effectiveness. Your heart rate is a better indicator.
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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