The "To Keep Up" Wiki

Popularized by the “Help I've fallen and I can't get up” television commercials, I'm collecting information on devices you can wear or have with you that can detect that you have fallen (and can't get up) and need help

This from Smita Desai 02jan2022 with edits by smi

Info on Apple watch (the latest version) https://www.apple.com/ios/health/

But the ECG and fall detection features were introduced in Series 5. Below is info on how it works. https://support.apple.com/en-us/HT208944

And a video of testing fall detection – https://www.wsj.com/video/series/joanna-stern-personal-technology/apple-watch-series-4-fall-detection-tested-by-a-hollywood-stunt-double/3940468A-DFEC-4F1F-A0F5-C9BAC8A26B1B?mod=Searchresults_pos1&page=1