Sorry not to be as nice as I'm usually but you'd better search by yourself before posting. If you'd done so, you would have find articles on the matter in the articles section. You can also use the search tool using key words (and edging is certainly one of them!). This question has already been answered several times.
Here you are: Edging | Penis Exercise
https://www.pegym.com/forums/pe-theory-science-forum/16205-why-edging-works.html
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