Working out harder is not always better. Sometimes, the body needs rest, and the Apple Watch Ultra 4 aims to make that decision easier with a new readiness feature.
Readiness uses health and fitness data collected by the watch to estimate how prepared the body is for exercise or other physically demanding activities. It considers recent activity, training load, vital signs, and sleep score before producing a daily score from zero to 10.
The score comes with one of four recommendations: Recover, Pace Yourself, Ready, or Go For It. This gives users a simple explanation instead of leaving them to interpret several health measurements on their own.
For example, a low score may suggest that the body needs more recovery after a difficult workout, poor sleep, or unusual vital signs. A higher score may indicate that the user is prepared for a more demanding training session.
The score is not fixed for the entire day. It can change as the watch receives new information, such as data from an intense workout or a shift in daytime vital signs. Users can also see which factors affected the result.
Apple said the scoring system was developed using data from the Apple Heart and Movement Study, with input from exercise scientists and physicians at the company.
The feature is supported by the Apple Watch Ultra 4’s new Health Sensing System and S11 chip. The watch measures heart rate every five seconds throughout the day and checks heart rate variability, or HRV, up to 24 times more often than before.
HRV refers to changes in the amount of time between heartbeats. Higher variability is generally linked to better recovery, while lower variability may indicate stress. The watch separates this information into recovery HRV for daily signals and overall HRV for longer-term health patterns.
Users can view daytime and overnight vital signs, allowing them to spot possible changes before these appear in their sleep data.
Readiness is not a medical diagnosis or a replacement for professional advice. However, it could help users make more informed decisions about when to train harder and when to give their bodies time to recover.
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