Sitting causes 173,000 new cases of cancer in the US each year.
Women who sit more than six hours a day increase their risk of early death by 37 percent compared to those who sit fewer than three hours a day.
For men, excess sitting boosts early death risk by 18 percent.
To make matters worse, exercise doesn’t necessarily undo the damage done by too much time on the butt. Studies show that 30 minutes on the treadmill every day (or doing any kind of exercise for 30 minutes)—while better than nothing—won’t negate the harm done by excess sitting.