Vote up to go ahead and let the exercises be posted on their own time.

I would favor prioritizing writing exercises for recent or upcoming reposts, and including any exercises written so far in the reposts. But tying the two projects together explicitly is courting failure; a delay in one should not delay the other.

I have misgivings about waiting "a while". I suggest proposing a specific timeline.

If a while is until, say, May 1st, I would favour holding off. But it needs to be something concrete, and measured in weeks, not months.

I'd prefer to get started, unless there is some clear and specific benefit to waiting which you can point to. These posts are going to come out gradually over the next 23 months, so there will be plenty of time to prepare most of the exercises. It looks like the earliest post for which an exercise is in-the-making is Making Beliefs Pay Rent (in Anticipated Experiences), which we're scheduled to get to in early June.

Coordination doesn't have to be perfect for the projects to benefit each other. If an exercise gets completed before the rerun post has been made then the post can still link to it, and if the exercise is completed a few weeks after the rerun post then it still gets the advantage of addressing a topic that's relatively fresh in people's minds.

Vote up to wait and do this concurrently with the exercises.

Karma balance.