That's not what the article says. The article is about the health risks of a sedentary lifestyle, which means a lot of sitting with limited physical activity.

That's not what the article says. The article is about the health risks of a sedentary lifestyle, which means a lot of sitting with limited physical activity. But even as little activity as 60-75 minutes of brisk walking per day seems to be enough to compensate. It also mentions that watching TV is worse than more active forms of sitting, such as office work.