After disabling a synced Apple Health exercise activity, it is not possible to re-enable it.

When I first started using the app I removed Active Energy from my diary and this stopped Cronometer from syncing that activity. However now I would like to use it and there does not appear to be any way to re-enable it. I have scoured the settings, I have disabled and re-enabled Apple Health sync, I have backfilled, I have reinstalled Cronometer and repeated all of those, yet it does not seem possible. I assumed that there would be a settings page where you could manage which activities were synced with Apple Health and re-enable or disable them as desired, but it seems there isn't, or have I missed something?