August 25 is the Grand Canyon National Park’s 100 year anniversary. It’s also the date Apple picked for its August Apple Watch Activity Challenge.
Apple Watch Challenge
https://twitter.com/kylesethgray/status/1161679136106004480
On August 25, Apple Watch owners can run, walk, hike, or wheelchair at least three miles. This is equal to a round trip of the South Kaibab Trail to Cedar Ridge, a popular hiking trail in the Grand Canyon National Park.