HR and HRV Balance is only available if you have a wearable device that's giving you that data, and you've connected it to Vively.
To connect your device to Vively, you'll need to go to the Account page, scroll down and tap 'Connect to TERRA' and follow the prompts.
Unfortunately at the moment, HR and HRV is only available on iOS. We are working hard to allow Android users to access this data!
If you have any questions, please email contact@vively.com.au