Apple

So I am visiting family and it seems like my parents have started liking the watch for its fitness and health tracking capabilities and they want to purchase it themselves. But before that they want to just try it for a few days. Is there a way that un-syncs my phone so that they are not able to access my personal notifications, data, etc.. and can still keep a track of their fitness data? I will be again syncing it after a week and don’t also want to lose my data. The do not also own an iPhone.