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. You stop breaking up fat in your blood stream, 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.
— If you’re reading this Tumblr post while sitting down, stand up! Here’s more reasons why.