Hi Jennifer
To receive credit for all Activity app rings, your Apple Watch must be worn during any given workout.
Third-party apps
Some third-party apps offer the ability to receive Move goal credit (but not Exercise credit, due to programming / API limitations) on your Apple Watch for workouts that are undertaken whilst it is not being worn. For example:
Fitmanual - Complete the Move Ring every day on the App Store
Other such apps may be available in the App Store.
Add data manually
Workouts can also be added manually to the Health app on your iPhone, which aggregates all health and activity data from your Apple Watch, iPhone and any other sources:
To add a workout, go to: Health Data (tab) > Activity > tap on Workouts > tap on the "+" sign (upper-right) > enter your workout data.
More information:
Use the Health app on your iPhone or iPod touch - Apple Support