This is lifestyle journalism at its finest, people. In the world of social media, “hair training” has become something of a buzzword. But for lots of people, not using shampoo to wash their hair is totally normal. It’s neither a fad nor a trend, and it has nothing to do with debunking haircare myths or jumping on bandwagons. I wanted to be one of those people. And, conveniently, I had just arrived back in the UK and, at the same time, worked my Lush shampoo bar down to the bone. The stage was set. It may be a myth that you can “train” your hair not to get as oily as it does when you first stop…