You cannot set your exercise goal to zero minutes though. The lowest is 5. Someone could set 5 minutes and then track a low intensity exercise like yoga (and not do anything), but that's fudging what is done.
Having to change move and exercise goals every time you have a rest day (some of us have one weekly to allow for recovery) is an inconvenience.
What would be better is being able to set a weekly set of goals. Here's an example:
- M-F with 600 move, 30 exercise, 14 stand
- Saturdays at 800 move, 45 exercise, 16 stand
- Sundays at 0 exercise, 250 move, 12 stand
Yes, that could be done (other than 0 exercise) manually but that's one more thing to do. Apple could allow for schedules.
I understand why Apple doesn't allow a 0 minute exercise goal but just because some people might abuse it by always setting 0 minutes doesn't mean it shouldn't be an option.