We all have been taught that intensive exercise is the best way to lose weight. Although This is a great way to lose weight, this exercise is discouraged during phase II of the HCG diet plan. Because the HCG diet permits only 500 calories per day, if a dieter burns more calories through exercise, the body will not get the nutrients it needs. It will only make you tired and exhausted. When a person is on the HCG diet, his calorie intake is limited to 500 calories per day because they are continuously burning thousands of calories to promote fast weight loss. 500 calories a day is not enough if you wish to do intense exercise. That is why the only exercises allowed are walking, yoga, stretching and other very mild exercises. Intense cardio is strongly discouraged.