To those that don’t know what that means, it’s when you apply conditioner before you apply shampoo as opposed to the usual status-quo of applying shampoo and then conditioner.
So not to speak about something I don’t know much about it, I’m just going to refer to an article on it which explains the nuances and intricacies a bit more:
Have you tried it? If so, has it worked for you? If, does it pique your interest?