Cardio fitness notifications are available today on Apple Watch - Apple
A low cardio fitness classification is displayed in the Health app on iPhone 12 while a
Download Mobile Applications
‎Interval Timer - HIIT Workouts on the App Store
You can download Apple Watch App For Tracking Hiit Workout for iPhone, iPad devices here.
Apple Watch App For Tracking Hiit Workout : Useful Links
Learn about the workouts that you can use to track your exercise with the Workout app on your Apple Watch.
Find out about the workouts that you can use to track your exercise with the Workout app on your Apple Watch.
Here are the new fitness and health features on the Apple Watch 3 and the
HIIT, or high-intensity interval training, workouts involve short periods of intense exercise alternating with recovery periods
to change the metrics that are recorded for HIIT workouts via the Workout app.
... most of high-internsity interval training with Apple Watch HIIT tracking
Track your most intense workouts with the Apple Watch Series 3 (GPS