Exercise and heart rate After reading a thread about overweight Americans I got to wondering about something; how does your heart rate factor into increasing your metabolism during exercise? Does the metabolic rate of your body cause you to actually lose weight or only cause you to lose weight faster providing you do not consume more calories than you burn? Perhaps this thread could get turned into something useful and members could post weight loss tips & techniques. How do you increase your body’s metabolic rate, and what’s so great about having it increased, other than for calorie burning? Is it done by shear torture of prolonged maximum physical exertion, or simply by taking the value of your 'at rest' heart rate, then raising and holding your heart rate at a higher value through exercise over a long enough period of time (30 minutes?). Does this cause your metabolic rate to increase and remain elevated, for several hours afterwards, thus helping you to shed weight even as you sleep? How do you know what your heart rate is suppose to be? Is it; (220 – your age)(0.4) = minimum level (220 – your age)(0.6) = maximum level ? I'll check back after I finish my triple-ground gristle burger.