It should be the same as the ancient sound travels thousands of miles. First of all, you should know how to use external qi to exert strength, and you should also know how to electrify your palm, and take the qi of external qi qigong out of your palm by using electrical toughness [don't practice unless it is harmful to your health]

After the external qi dissipates, you can practice internal strength and hold your breath. It takes about a year to succeed [mainly good health]. Experience 1977 internship in Wuzhou, Guangxi, 20 10.