Last week I did a healing on someone who had problems with an elbow. He explained that he was going to be playing racket ball. While I was doing the healing I kept that in mind and made sure that I gave him energy to both the upper and lower dantian. The next day he told me that he played 11 rounds and won the tournament and had the trophy to prove it. So It seems to me that Qigong boost performance level in a person who is already in good physical condition.
