For this experiment of one:
When I was riding to the office, a rest day might mean taking it easy on the day after an after-work ride. The 41 minute commute would then take 45 minutes (it's amazing how little difference in ride time a huge difference in effort made!). Or taking a day off after a century ride or longer.
WFH, I've found it increasingly hard to get motivated to ride when it's raining. The next rains-all-day that hits on a weekend will probably be spent doing income taxes. Of course that involves a lot of standing, walking, squatting, and walking some more trying to find that silly scrap of paper that didn't get filed correctly. I've been known to go the the mall or a big box store and try to walk it for 20-30 minutes.
If I prop my feet up all day and watch the world go by for two days in a row, I'm probably sick.