Hey danny, sorry to hear that, but its a common illness to people who sit around alot... us nerds... heh.
Anyways, as a personal fitness instructor, I can recommend some exercises for you. Well, push ups do exercise the lower back slightly, since you have to keep your body straight the whole time. But by the time you feel your lower back worked you have already got a chest and arm the size of rambo. So the simplest/lightest work out for the lower back is the plank position: first you lie flat on your stomach, then push yourself off the floor w... (
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