Power From the Feet

My teacher mentioned a small little point today that I thought I should share. When shifting your weight around, such as when you are pushing with your back leg, the power comes from the sole of the feet, and not from the hips. A lot of the time, the kua is not relaxed, the muscles around the hip area thus become tensed and power cannot be properly transferred from the feet up to the rest of the body. I think what he means is ultimately, relax the kua so that the power from the feet can reach the rest of the body, to where it is needed.