Is MFP really that bad at estimating calories burned? If I enter 45 mins of competitive swimming in my german calorie tracking app, it gives me 595 calories, not even 2/3 of her number. Those numbers can't be too far off, because I always eat those kcals back and I have no signs of unintentional weight gain. On the other hand, she looks like she weighs twice as much as I do as a 6 ft tall guy. Then again, I doubt that she did anything close to "competitive".