The modern lifestyle is a mostly sedentary one with most people spending more time on their backside than on their feet. All this sitting with little or no exercise is doing a lot of harm to the body and can affect the health negatively.
Basically, sitting is a normal human body posture, and when people work, socialise, study or travel, they often do so in a seated position. It’s second nature.
However, it’s the amount of sitting that’s the problem as it can be harmful if you do too much of it – and these days, our lifestyles encourage most people to sit more.