I've been losing the top layer of fat on my abs for a while now using the ketogenic diet. But I need to start building muscle there now. Does anyone know a good site or guide which actually has factual evidence and practical application for achieving it? I don't want to find out just "what works". I'd like to know the theory/evidence behind it, the science even. I don't believe things based on people's experiences anymore, I like to understand how exactly it works. So i'm looking for information about building up my abs which is proven scientifically and through results. Surely one of us knows the truth about abs.