Can play the role of detoxification. For example, purple and red spots are bruises and congestion in the body. Doing this often can remove moisture and cold from the body.

This is still the so-called tapping detoxification method, which makes no sense. Although there will be bruises similar to scratches after knocking, its strength can not be underestimated. Congestion will lead to the absorption of heat, which is harmful to human body. Don't blindly follow suit. The best conditioning is physical exercise, such as square dance and Tai Ji Chuan, which are effective means to improve physical fitness.