Anyone else notice that when they were heavier it was easier to get your heart rate up? I know that when I was heavy(230lb) I could get my heart rate up by briskly walking or lite jogging. Now i have to run as hard as I can to get my heart rate up to the same level. If we are healthier now shouldn't it be easier...not harder? I understand why it is harder, I just think that it is a big bummer.