According to the Food and Nutrition Board at the Institute of Medicine and a study conducted by Janssen et al. in the Journal of Med Sci Sports and Exercise, it was demonstrated that subjects with the most success with weight loss and weight management participated in a minimum of 2000 calories worth of exercise per week. For most people this can be accomplished by exercising for one hour per day, 4-5 days per week at 75% of your maximal heart rate (220-age). Example for a 40 year old.
((220-40) x 0.75) = 135 bpm (exercise heart rate)
