Apple announced updates to their WatchOS at WWDC event, introducing new features for endurance and everyday athletes such as Training Load and Vitals. Training Load calculates effort based on workout duration and heart rate, allowing users to adjust ratings for accuracy. The Vitals feature tracks overnight metrics like heart rate, respiratory rate, and sleep duration, presented in an easy-to-understand format. While Apple's approach excels in accounting for long, low-intensity activities, there are minor bugs and improvements needed. Users can view Training Load and Vitals data on the Fitness app, with the potential for additional insights and tweaks before the final release in September. Overall, Apple's new features offer mainstream users a glimpse into their workout trends, with room for enhancement based on beta feedback.