As many others here, I have been (and in some ways still am) in the same situation myself. My advice, find something else to do in your spare time. Many people

As many others here, I have been (and in some ways still am) in the same situation myself. My advice, find something else to do in your spare time. Many people recommend excersise. Remember, excersise doesn't have too be going to a gym, or going jogging. There are plenty of activities that will give you a good workout as a bonus. Personally, I like chopping wood. Also, if you are able to, try to take a little longer lunch breaks and spend the extra time doing non-work related stuff. Outside if you can.