Did you realize that we sit on our butts 12 hours per day on average? Sitting down as much as this is clearly bad for us and some research suggest that those who sit all day live around two years less than those who are more active. Most of us are guilty of excess sitting. We sit at work, in the car and at home. In a very interesting study conducted on the elementary school level in Texas, students who stood during class at special stand-up desks performed better all around compared to children who sat at their desks!