Question
Here's my situation, do you have any possible advice?  I have been experiencing fatigue with my lower back for a long time now.  It started over 5 yrs ago, I had a sports car which didn't have great seats with lumbar support.  I couldn't drive long distance without it making my lower back have that  fatigue feeling, I assume that is what you call it.  So I started working my lower back muscle at the gym.  To sum it up, I finally purchased a new car that has great adjustable lumbar support in 2007.  From what I can remember, everything was find then, I could go however long I wanted, never felt anything with my lower back (it was great).  I continued working my lower back in my normal routine and has been quite a few yrs now, 1 set a week, but quite a bit of weight to get it nice & strong.  I never did too much that it hurt, but it was tired when I finished.  Now, I have the feeling all day, no matter what I sit in (been like this for a long time, a year or more). I work on the computer as my day job, but have had an ergonomic chair for 5+ yrs now.  I stopped working my lower back all together back in June/July thinking maybe that isn抰 good or see if this helps.  I started working my abs more so and it seemed to help some for a little while.  I抦 not sure what is going on.  I didn抰 have any injuries to cause this, I抦 not a crazy heavy lifter and no one else I know has this problem and most of them don抰 work out, and they are not fit by any means.  I am finding myself making slight movements of my lower back all day long to get relief.  The only time it isn抰 bothering me is when I抦 lying on my bed, which I sleep on a sleep number bed.   I抦 lost.  I don抰 hear all the overweight people in this country complain about this problem and they have a lot more weight in the front than I that causes extra work on that muscle.

Answer
I don't know what exercises you are doing for your lower back, but if they include using the Roman chair or doing back extensions, that is not going to help you in the long run. Exercises such as lat pulldowns or rows also do not work on the lower back muscles, at least not in an effective manner. Although the previously mentioned exercises are good, they are not going to keep you pain free unless you address your core muscles. This does not mean sit ups. I would recommend that you research proper core stabilization exercises, these exercises are necessary to strengthen the muscles that work to stabilize your spine. This includes the transverse abdominus and multifidi. There are plenty of websites that address core stabilization or perhaps speak to a chiropractor that focuses on rehabilitation.

Best of Luck