This is from the book "This is Why You're Fat" by Jackie Warner:
"Thinking positively will definitely help you shed weight, according to a Harvard study. Scientists found that simply believing that you're doing enough exercise can shed pounds. They made this discovery by monitoring a group of 84 female hotel housekeepers who complained that they were not getting any exercise, despite their strenuous jobs. Half of the test subjects were told not to worry and that their work provided them with enough eercise to lose weight and maintain a healthy lifestyle. They were even told how many calories they were burning doing specifidc tasks such as vacuuming, changing linens, and sweeping floors. The other half were told nothing about the health benefits of their daily chores. All the subjects cleaned abou fifteen rooms a day, taking twenty to thrity minutes each.
After four weeks, the informed group had lost an average of two pounds, lowered their blood pressure by almost 10 percent, and recuded their body fat. The other group had no noticeable changes in health or physique. This study shows that if you can put your mind in a healthy, positive place, believing that you are burning calories or losing weight, you can achieve amazing physiological benefits."
(Warner, Jackie. This is Why You're Fat. Grand Central Life & Style, 2010, p. 199.)
Of course, this won't work if you really AREN'T doing any exercise all day :-) But, don't discount the exercise that you ARE doing, and the housecleaning, etc. It all adds up! Keep a positive attitude, ladies!