I'm 27, in grad school.  I can't afford to join a gym right now and have a pretty busy schedule.  I'm trying to stay motivated exercising, but I tend to lose steam.  

I lost about 18 lbs 6 years ago, but the weight has been creeping back on since then.  I'm now about 10 lbs over my lowest weight and I would like to change that.  I really like taking gym classes, and in general I walk a lot.  I broke my foot several years ago and it still hurts when I run, so I need relatively low impact exercise.