New (clean) install of iOS 9 while retaining Health/Activity and Apple Watch data I'm planning on doing a new clean install of iOS 9 on my iPhone because I really like to have a clean slate when changing iPhones and upgrading iOS. However, the fact that Health, Activity, and Apple Watch data isn't synced to the cloud has made this difficult this year.

Is it possible to do a clean install of iOS 9 on my iPhone and also retain Health, Activity, and Apple Watch data? Or is it only possible to upgrade / restore from backup to keep that data?
No, you cannot only restore Health data from a backup. Only encrypted iTunes backups and iCloud backups store Health.app data.