S Health is one of the biggest selling points for newer Samsung Galaxy devices. It offers a centralized place to view and manage data collected by all of the various sensors like the heart rate monitor.
As wonderful as this service is, all of its features are not available in all countries. Presumably due to legal concerns, Samsung removed S Health features like "Stress Level" and "Heart Rate" in several regions across the globe.
But developer Jiannist has recently created an Xposed module that will remove these region-based restrictions. With this one installed, you'll be able to use all of the features of S Health, no matter what country you're in.
To begin, head to the Download section of your Xposed Installer app and search for "Global S Health," then tap the top result.
From here, swipe over to the Versions tab, then hit the "Download" button next to the most recent entry.
After a few seconds, Android's installer interface should come right up. Tap "Install" on this screen.
When that's finished, you'll get a notification from Xposed telling you that the module hasn't been activated yet and that a reboot is needed. Just tap the "Activate and reboot" button on this notification, and Xposed will handle the rest for you.
When you get back up, any S Health features that were previously region-locked in your area should now be available.
If the features are still missing, you'll need to update your S Health app and make sure the "Health Services" app is also installed. Both of these can be found in the GALAXY Apps store.