It's the prolonged sitting that is the problem and it has been shown that if you get up every so often (half hour or hour) for at least a minute, you can stop the process.

What amuses me is that they didn't give any ages or anything; remember, everyone has to die of something! They get people all worked up about "oh you can have a heart attack or stroke!" as if people can avoid eventually dying of something.

I work on the computer 6-8 hours a day but I enjoy that, it's what I "do" and yes, eventually something is going to kill me, probably my heart or a stroke (biggest problems for my ancestors). But I'm 60; I'm hardly going to die "young" am I? I'm retired, have done the work, raised the family, buried the parents, etc. It's all part of life and yes, I do get up every now and then to stretch, wander outside to check the weather (and get cold :-), etc.