I don't think people know that simply getting up and walking for 10 minutes every 2 hours would reduce their body fat levels. In fact, I've seen a study [1] which concludes you simply can't undo a days worth of sitting with a vigorous exercise session. I think science is starting to show that frequency of movement is an important part of a healthy lifestyle, not just intensity of movement. Going to the gym after 8 hours infront of the computer is just not sufficient to combat weight gain.