Being good at MQG is a natural outgrowth of robust health, and the MQG practices produce robust health when trained properly. Martial Qi Gong produces exquisite self-control. It strongly safeguards against self-deception. It provides an immediate, physical illustration of internal struggles similar to those found on the enlightenment path. Martial Qi Gong is about maintaining internal harmony in situations that are very much against this harmony.
Internal harmony is the root of defense and offense.
In clearer words, it will allow you to enter into highly adverse and chaotic situations while maintaining a crystal-sharp mind. It will enhance the function of your body, providing you with greater strength, reflexes, and sensing. It will dramatically extend endurance. It will reduce vulnerability to blows. I have heard th at there are two paths of Qi Gong training, external and internal.