Sedentary work means that you spend a large proportion of your working day sitting down or being inactive. This is usually the case for people who work at the computer, whether in the office or at home. At work people usually have access to a decent office chair, but many people use an ordinary chair at home. In combination with sitting still for long periods, that is twice as bad for your health.
After all, the consequences of sedentary work are not to be underestimated: they range from back problems to obesity, diabetes and cardiovascular disease. On the one hand, it is important to invest in an ergonomic workplace with an ergonomic office chair that stimulates active sitting and an adjustable desk that also allows you to work standing up. On the other hand, it is a question of breaking the sitting habit. That means things like taking short breaks (including a little walk) or simply paying attention to micromovements while you are working.