The report looked at 70,000 women enrolled in the famous Nurses' Health Study.
They were followed for about 18 years, and their activity levels were recorded. The most active members spent less than 10 hours a week sitting.
Investigators found the risk of developing pulmonary embolisms was more than double in the women who spent the most time sitting around. And weight had nothing to do with it.
People die from blood clots. And the way you get them is partly from a lack of blood flow.