Scraping method:

Stand with your legs apart, stand up straight and tighten your abdomen. Take Spin Bian Shi's standard scraping board and scrape the chest along the lower edge of the rib, all the way to the lower abdomen and from one side to the other. First scrape from the lower edge of the ribs, then scrape the middle, then scrape the lower abdomen, from top to bottom, from left to right, and then from right to left, with moderate strength. You can look at the websites of Bian Shi Encyclopedia and Bian Shi Health Care, where there are video guides.

I hope my answer can help you and be adopted!