Most writers love to read. The written word becomes spellbinding. Besides doing it for pleasure, reading will improve your writing. Take note of author’s styles, use of language, dialog and description. Notice the movement of the characters throughout the story.
Author Maggie Stiefvater recommends to aspiring authors to read, read, read. She did not take any creative writing classes, but she is a voracious reader (as told in a Borders interview). Reading is like studying about writing, while enjoying a good story. It is good to read various genres, to get a good idea of what works for your style.
So, next time you pick up a book, think of its benefits to you as a writer, besides being pure entertainment.