Hey uhsa,
Great suggestions from the group thus far. Just a few more from me from what I've seen from my students and from some time-consuming pursuits in my own life:
1) Make it a part of your life - don't fight the rest of your life for it.
What I mean is that you have to find a way to live with your schedule...if you're constantly dreading it or resenting it you're much more likely to quit. So build it in around things you like to do: plan to study at the library from 6 to 8 twice a week but ask friends to meet you at the bar around the corner to blow off steam after. Or make your study nights something you look more forward to by planning to pick up your favorite takeout on your way home from the library or by keeping your favorite candy or snack nearby for only when you study. Build it into your routine and have some light-at-the-end-of-the-tunnel items planned so that you start to enjoy what you're doing.
2) Keep a calendar or journal to record your study sessions
This has worked wonders for me in some of the endurance-sports training I've done. If I can look at a week on the calendar and see more than 1-2 "blank" days on which I didn't do anything, it's hard to feel good about what I did that week. But at the end of the week or month when I tally the hours/miles of a productive period it's easy to be proud of the work I put in. Just by keeping a log you keep yourself accountable, and you also allow yourself a little bit of flexibility. If your goal is 10 hours a week, you can skip your regular Tuesday night because your friend got great concert tickets...you just know that by the end of the week you'll want to have accounted for those hours.
3) Make quality the focus of your sessions; not quantity
If you just go to the library "to do problems", the time will go pretty slowly and you won't feel yourself making a ton of progress. But if you give yourself a specific assignment - e.g. "to become much more comfortable with factoring in algebra" or "to pay closer attention to conclusions in Critical Reasoning" - it's easier to see progress and you have a more manageable goal for that session.
In your own personal situation, I'd definitely recommend against giving up the gym completely...I'd hate to see you give up on working out altogether. That's probably a pretty healthy part of how your body reacts to stress, etc. If you can incorporate studying into a gym routine - spend an hour at the library then an hour at the gym, for example - that's probably ideal. And while multitasking can be tricky, I know that I've actually been getting a lot of reading, email, and education in while sitting on a bike trainer for a few hours at a time recently, so you may be able to take advantage of something like the Veritas iPhone app while you're doing some mindless cardio...
Brian Galvin
GMAT Instructor
Chief Academic Officer
Veritas Prep
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