Research points toward reading as the most effective way to increase skills in reading itself, writing, vocabulary, grammar, and spelling (Krashen, 2011).
The more you read, the faster you read (Anderson, Fielding).
Given free choice, lots of books, and reading advisory most readers advance themselves up a ladder of reading difficulty on their own (Lesesne, 2010).
Evidence suggests that light reading provides the competence and motivation to continue reading and to read more demanding texts (Krashen and Ujiie, 2005).