Since 2008, China has observed National Fitness Day on August 8. And in recent years, Apple has marked the occasion with an exclusive Apple Watch challenge. This year will be no exception. National Challenge Day set for August 8 As in previous years, Apple will challenge users in China to complete a 20-minute workout to unlock a custom animated sticker pack to be used in iMessage, FaceTime, and other messaging apps, as well as a special achievement in the Fitness app trophy gallery. Here’s Apple: ”Let’s get moving for National Fitness day! On August 8, earn this award by doing any workout for at least 20 minutes. Record your time in the Workout app or any app that adds workouts to Health.” As with every special challenge, the virtual trophy and animated stickers will only be available to those who complete the workout on a specific date (in this case, August 8). And as a reminder, like in previous years, this specific challenge is limited to users in China. Do you collect Apple Watch Challenge trophies? Let us know in the comments. Accessory deals on Amazon