The rules for the challenge are simple: complete any walk, run, or wheelchair exercise that lasts 50 minutes or longer and unlock the achievement:

Like previous Activity Challenges that promote exercising with Apple Watch, the latest national park-themed challenge will unlock animating themed stickers in the Activity app for Messages as well as an award in the iPhone’s Activity app.

These rewards are only redeemable for one day, so mark your calendar and plan accordingly. Apple Watch customers should expect an alert for the challenge next Friday. The challenge should also be available internationally.

Starting with iOS 12 next month, Apple will also include new Activity stickers in the Messages app that appear without completing a special activity challenge. These include animated figures that run, swim, and walk, as well as a variety of other exercise-themed options.

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