Treadmill and calories
I was in the Precor treadmill at the gym today, it's the kind with hand sensors to monitor your heart rate. I walked pretty fast for with a 14% incline at 3.1 speed (I guess that's mph). I was at 70% of my max heart rate for almost 40 minutes. At the end of it the machine said I burned 400 calories!!! Is that even…
