Paida with love
Concentration and positive attitude will stimulate the vital energy in your body. You should firmly believe that you are your own best doctor and that you can self heal. Distracting, negative thoughts could bring negative effects.
Pat with solid slaps
If you feel the pain of slapping, that means you are on the right track. The pain will clear away the illnesses.
Paida with your mind
When slapping the skin, you can imagine that you are injecting fresh Qi into the body and bringing out the dirty Qi.
Use your palms and fingers properly
When slapping a large area such as the front of the knees, use both palm and fingers; if the area is relatively small, such as the back of the knees, you could mainly use the fingers with agile movement of the wrist.
Best to recite or chant mantras or scriptures while patting and slapping. Reciting mantras or scriptures will bring a better result and you may choose your favorite ones.