How does power pumping work?

Unfortunately, although I agree power pumping helps, I was one of the unfortunate few that couldn't produce enough yield. To add on to the mummies' advise, although there is no scientific linked between stress and low supply, I believed that it does somehow play a part. It helps if you relax and look at your baby and remind yourself that it's for the better for your child and think of how cute and adorable he is :)