Require a small project that can track a heart rate on the apple watch and show it in an app. You then need to be able to post the result to Health kit when they are done.
User will be able to press "start" in the app, the app will start tracking, then when the user is done they can then select "save" in the app, and the app will save the data to Health kit.
This should be a very easy project for someone familiar with the watch, and health kit.