New research shows that even regular exercisers may not be doing enough to counteract the health hazards of sitting down at a desk all day long.
Sitting for long periods of time — when you don't stand up, don't move at all — tends to cause changes physiologically within your muscles," says Reynolds. "You stop breaking up fat in your bloodstream, you start getting accumulations of fat ... in your liver, your heart and your brain. You get sleepy. You gain weight. You basically are much less healthy than if you're moving.