You can download the watchOS 26 developer beta to try out the Liquid Glass design and Workout Buddy feature before the public release.
Beta software may be buggy with broken animations and features, so it's recommended to wait for the public beta releasing in July.
To download the watchOS beta, you first need to install iOS 26 on your iPhone, then enable beta updates in the Apple Watch app, and finally download the watchOS 26 beta update.
The watchOS 26 Developer Beta is for app developers to test new features quickly, while the watchOS 26 Public Beta, releasing in July, offers a safer way to try pre-release software.