[inetsee]

If it is true that frequent, brief, moderately intense exercise is that beneficial, I can see several ways that office workers can fit that into their workday.

If you work in a multi-floor office building: when going to the restroom, walk up stairs to a restroom on a floor above the one you work on; if you go out for lunch, walk to lunch, then walk up the stairs when you get back; if you are going to a meeting, leave you desk a couple of minutes early and walk up and down the stairs before going to the meeting room.

All of these ideas have something in common: walking up stairs is as close to HIIT that most people get during their day.