You don't know how long they have been sitting there, or whether they are taking regular stand-up walk-around breaks. It's fine to sit on a bench or a chair fo

You don't know how long they have been sitting there, or whether they are taking regular stand-up walk-around breaks. It's fine to sit on a bench or a chair for a short period of time. You might as well say they shouldn't all be looking at tiny laptop screens that are not at eye level. In the back of the photo it looks like there are some chairs designed more with ergonomics in mind -- the black ones with mesh backs.