A good tip that may help you get fit is to eat cottage cheese or milk before bed. Cottage cheese and milk, along with a few other foods, contain casein protein, which actually promotes lean body mass when eaten before bed. There are also protein powders that contain casein protein.
You can get the maximum back workout by doing your lat pulldowns and pullups properly. This means that instead of wrapping your thumb around the bar in your grip, place it on the top next to your index finger. What this does is decrease your arm's involvement so that your back reaps the benefits of having to work harder.