Slouching
“If you are leaning over, our heads are very heavy compared to rest of body—it puts a lot of leverage on the neck,” Dr. Fowler says, which can lead to tension headaches. So, leaning over is bad for your back. “This can increase the risk of a disc rupturing or herniating, resulting in pain and pinched nerves,” he says. And this is not all – slouching can decrease the amount of air you take into your lungs.