Yesterday, Microsoft announced their fitness band that was meant to complement, not replace, your actual watch. At $199/£125 it’s a palatable entry into the almost smartwatch for WP users. You can read messages/notifications and even send messages with Cortana. The main bit is the sensors that’s used to collect data about your fitness. Plus it has its own GPS.
The workout guide is interesting. You can download workouts from various resources and then it will help you with them.
When on standby, there’s the always on clock that Nokia popularised.