Why SSR? (Reason #4 of 3,487,659) Reading for fun improves your writing. The more you read, the more you see what good writing looks like (and bad writing too!) You can read about writing, but more importantly, whatever you read, non-fiction or fiction, you see examples of writing. You learn from the examples to make you a better writer. The more you read, the more you are exposed to a wide variety of writing genres, styles and methods. The more you read, the more ideas you get for your own writing.
Of course, even better: (Reason #1) Reading for fun is fun.