I would say that most of the time people associate practicing the guitar with sitting down, grabbing their guitar, and then practicing scales, licks, and other things that the person wants to improve on.
However, I believe that you can develop your guitar playing by practicing without a guitar as well. True, there is no substitute for actual guitar playing practice, but many times I think this technique can really benefit you.
So what am I talking about doing? I’m talking about visualizing yourself playing the things you are working on in your head. You see the guitar in you hands, and you see yourself performing these licks, bends, phrases, and solos perfectly just like they should be played.