I don’t know which health app I need to monitor my heart on watch
Which apps do I need on my watch to get blood pressure readings and monitor my heart, also there is supposed to be one that will tell if I fall
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Apple watch doesn't measure blood pressure and there is fall detection here;
Use fall detection with Apple Watch – Apple Support
There is a heart rate monitor app and if you have a watch 4 or higher there is also an ECG monitor app.
Monitor your heart rate with Apple Watch – Apple Support
Taking an ECG with the ECG app on Apple Watch Series 4, Series 5, or Series 6 – Apple Support