10 hidden Activity app features that will take your fitness to the next level

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Discover the secrets of the Apple Activity app.
Discover the secrets of the Activity app.
Photo illustration: Graham Bower/Cult of Mac

At first glance, the iPhone Activity app seems pretty simple. It’s basically just a calendar to keep track of your daily Activity Rings. But if you know where to look, you’ll find a surprising number of pro features buried beneath that slick, simple interface.

So check out our top 10 iPhone Activity app tips and discover some indispensable stats that will help take your fitness to the next level.

Apple Watch can detect serious heart problem

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Apple Watch heart-rate monitor
The heart-rate monitor in the Apple Watch can also diagnose an irregular heartbeat.
Photo: Apple

Apple Watch can accurately detect atrial fibrillation, a serious heart condition that is a leading cause of stroke.

This advanced feature remains in testing. However, a new medical study offers proof that wearables can do far more than simply track fitness. In fact, they could actually keep the wearer alive.

Apple Watch users plagued by heart rate monitor failures after updating

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If you look closely you can actually pinpoint the exact moment the Apple Watch heart rate monitor stops working.
If you look closely you can actually pinpoint the exact moment the Apple Watch heart rate monitor stops working.
Photo: The Simpsons, 20th Century Fox

Apple issued its first Apple Watch software update this week, adding new emojis, fixes for Siri and more. Unfortunately, hidden among the positives is one fairly big negative: Multiple users are complaining that the 1.0.1 update stops the device’s much-touted heart rate monitor from running as it should.