Most people burn between 6 and 10 calories per minute. 6 at the lower end with less intense exercise, 10 would be a more vigorous workout. This holds true pretty much regardless of the form of exercise. It sounds like you are definitely working out at the moderate end (which is smart when starting out), so I'd go with a figure of 6-7 per minute, or 90-105 for a 15 minute workout.
While it is true that higher levels of activity do need an appropriate intake to support them, automatically 'eating back' exercise calories can potentially undo your hard work. 100 calories 3 times per week is unlikely to trigger a need for a higher intake.
Just enter your exercise into your Spark Exercise Goals, and Spark will calculate a recommended intake based on your needs and sound nutritional principles. You may need to redo this over the coming weeks as you gradually increase your workouts.
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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