Activity points are not the same as the "calories burned" calculations you'll find many places or on many pieces of exercise equipment. They don't seem to be linear (meaning it takes a lot of time to earn the first and second point but less and less for the next points), it's not correlated with other exercise "point" formulas that some pieces of equipment read out...it's mysterious, but I've read elsewhere that one reason you might earn 4 points for doing activity that burns close to 500 cal according to your treadmill or whatever is to allow you to eat a little more without totally wiping out whatever benefit you could get from exercise.
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