Actions are meant to be specific, meaningful steps towards a broader goal (or an activity fully worth doing on its own merits.

Almost by definition, a recurring or repeating action is NOT that.

To wit, this is NOT an inspired Action Plan:

"Brush Teeth" is admittedly pedestrian, but anything else will look similarly uninspired and monotonous.

A recurring action instead is the stuff of developing some habit or routine practice.  And THAT, happily, is well supported as a Binary Metric.

A binary Metric is one that is a matter of a one or a zero, a yes or a no, i.e. did you do it or did you not.

When you create a Binary Metric for whatever you had in mind for a recurring action, you'll have the benefit of being able to define for how long you want that practice to be "assigned", on what cadence (daily, weekly, weekdays only, etc.), simple settings that are easy to adjust later as needed (e.g. to keep going or cut short).

Your client, in turn, can get a routine reminder via email or text, allowing them both to recall doing whatever action and report back with a simple reply (no need to log in).  They can also add a comment to each day that they report, allowing the building of a story behind the "yes" or "no" around doing it.

This all builds a nice tidy graph, which visually shows you and your clients the complete and growing history of that recurring action, including cold streaks and hot streaks and the story behind them (thanks to those comments).

So if you're wanting to create a recurring Action for your clients, do them one better by setting in motion a Binary Metric instead!  If this is something you commonly assign, you can even make this super easy with a Metric Template.