Apple Watch users can mark their calendars for the next activity challenge. The 2025 National Parks Challenge is set for this Sunday, August 24. Here’s the description for the upcoming Apple Watch activity challenge: On August 24, let’s celebrate the great outdoors and the world’s national parks. Earn this award by recording any workout of 20 minutes or more with any app that adds workouts to Health. This particular challenge supports any workout type, as long as the duration is at least 20 minutes. As ever, completing the challenge will unlock a virtual trophy as well as animated stickers that can be used in Messages, FaceTime, and more. Stickers will include an animated version of the virtual trophy, a whale surfacing from the ocean, someone hiking, and someone kayaking. Expect the alert to go out to Apple Watch users closer to the event this weekend.