To enable Apple Health, please check the following settings and see attached screenshots.
1. Open the Insight Timer app.
2. Select your Profile icon located in the lower right
3. Click Settings
4. Scroll down to Apple Health
5. Then select Continue, Request Access, Turn All Categories On, Enable Mindful Minutes
6. Select 'Allow.'
Then, Launch iOS settings.
1. Select Privacy
2. Click Health
3. Ensure Insight Timer is selected.
If you still don't see the Insight Timer app in the Health section under your iOS settings, please log out of the app, reboot your device and log in again.
You may also want to ensure your iOS software is up to date.