Following the release of iOS 9.3, Apple has just released watchOS 2.2. This version has been in testing by Apple and developers since January. We’re finally getting on hands on this rather boring update. Aside from some bug fixes and improvements, we see the ability to connect multiple watches to a single iPhone. The iPhone with iOS 9.3 brings this functionality, but this version of watchOS is what allows all of this to happen.
To get this version, go to the Watch app > General > Software updates > watchOS 2.2. From there you can download and install the update. Make sure that your watch is within range of your iPhone, has at least 50% power, and is charging.