Comment Just go out there and run ... or walk (Score 1) 635
Assuming you're not too far from the great outdoors, you can just get yourself off your screen reading Slashdot entries over lunch and go out running or walking at a fast pace for a half hour. I found running or walking is just about the simplest thing you can do : no need for a gym or for sophisticated equipment,except good shoes and proper clothing.
I started doing that 2 years ago (I run 4-5 km 3 times a week at lunch) and it does a LOT of difference. You need to set a few things straight though. The first things is : *always* fit your schedule to avoid being refrained from doing your noon jogging periods. You will always find a good reason to skip a training session if you don't do that. When I have people to take care of on a day I'm supposed to run, I politely let them go have lunch by themselves while I do my thing. I found it's probably as good NOT to go to lunch to do more of the same thing (e.g. talk about work) than to impose a mutual break. Just make sure you have a good deodorant if you can't take a shower though ;-) I'm not running today because I was sick last night. Otherwise,I wouldn't be commenting :-) Oh and if you do run : do NOT forget to stretch after.
Good luck !