https://www.cnet.com/news/pokemon-go-lets-you-track-steps-with-apple-healthkit-google-fit/

So, you'll be able to earn candy and hatch eggs even on the days you forget to boot up Pokemon Go.

You'll have to opt-in to the feature and decide how much data you want to share with Apple or Google's health apps, developer Niantic noted Thursday in a blog post.