Scheduling and tracking important but not urgent items

Clearly my system for catching questions is not great because Laura left this question for me ages ago.

I have a question relating to calendars.

Do you have a system for regular things that you would like to but don’t want to schedule per se? So, for example, your walks. Let’s use the scenario that you want to go for four walks a week but you don’t want to schedule them all out in advance, you just want to do them at any given time during the week.

I know one option is to write when you ha...