Huawei Health application is the most important app for Huawei Watch GT, Watch GT 2, Watch GT 2e and Watch GT 2 Pro. You can download and install new watchfaces here, there is also interesting set of settings. If you want, you can install betaversion of Huawei Health application, so you will get new features before they are release officially.
I will regulary put new informations about Huawei Health Beta here, so you can check any time if you have the latest version. You can download the latest Huawei Health Beta here.