Hi
Apple Watch includes a built-in Timer app, but it does not include an automatic repeat option:
https://help.apple.com/watch/#/apdf448955b2
The built-in Alarm app includes the option to repeat any given alarm daily (including the option of every day or just on weekdays or at weekends):
https://help.apple.com/watch/#/apd27ce65478
Various third-party timer and alarm apps - including interval timers - are available via the App Store.
When searching for apps via the Watch app on your iPhone (using the App Store and Search tabs), results are pre-filtered to show only those iOS apps that also include an app for Apple Watch.