You are personA:
You have a family that tends to be fat, and sedentary.
Then your calorie burn per minute of X exercise would be so high.
Then we have you could be person B
Your family its normal.Not fat or thin.
Your calorie per minute its near standard so you are gonna fit right with the calorie counts.
I could go on and on and on with different types of ppl but i think the point had been gotten.
The calorie count its a Guide so you know the motivation and consistency its the key to achieve your goals wherever they are to get lean, to lose weight or to gain mass.