Could this be right?

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Good afternoon MFP's! Just bought Belly, Buns and Thighs Slimdown DVD today and I couldn't wait to try it and boy do I LOVE IT!!! Just wondering about how many calories I burned if I did 3 miles at 4 MPH for 40 minutes? My New Balance HRM says that I burned 156 :sad: , could this be right? Please advise.:huh: