So many people are apparently are getting healthier with Apple Watch OS 4 people are going to be able to do even. Features like Smart Activity Coaching will help more people, like me, close rings more often.
A completely redesigned workout app with High Intensity Interval Training (Hiit). New features for swimmers like auto sets and gymKit an industry first. Gym Kits is activated just by tapping your watch against machine to get going and all your metrics will be in synch.