People sit too much. They sit at work, in their cars, at home watching TV, while waiting, while flying (like I'm doing now), and plenty of other times. It's become the default position in the lives of modern humans. This is bad for lots of reasons, some of which I've written about before.
But one of the most tragic things is seeing people sitting down while trying to get stronger. Seems counterintuitive, doesn't it? And yet if you go to a gym you'll likely find more people on their butts (or their backs) than on their feet.