It’s time to close those rings again! Today, Apple is celebrating National Fitness Day in China with its yearly Apple Watch Activity Challenge. So, if you happen to own an Apple Watch and live in the country, get ready to jump into a workout and close those rings to earn some sweet digital awards. Apple has been hosting an Apple Watch Activity Challenge in celebration of China’s National Fitness Day for a few years now so, if you haven’t participated yet, today is a great opportunity to do so. How do I complete the challenge? According to Apple, the challenge...