Earlier this month, Apple took the covers off the latest iteration of its Watch lineup in the form of new Series 4 models, with reduced bezels and increased screen sizes. Since then, the new Apple Watches have launched and Rich Woods has even shared his unboxing and first impressions of the 44mm model in stainless steel.
However, there are a couple of new features that have garnered some attention since the original announcement, such as the US-only, FDA-cleared ECG functionality and fall detection. Specifically, with respect to the latter capability, it seems that the latter won"t work for many people out of the box for one reason as pointed out by No1ARSoul over on Reddit. As noted in the online manual for the Apple Watch Series 4, fall detection is only automatically enabled if a user has entered their age during the setup process for the smartwatch or have populated that information in the Health App. Otherwise, younger Watch owners will have to adjust this setting given that the corresponding default will be "off".
That said, there may appear to be a case in leaving fall detection disabled, particularly for the more physically active among us, as the online manual warns that it will be "more likely you are to trigger fall detection due to high impact activity that can appear to be a fall". This may suggest that the feature could still require some further refinement to avoid false positives being triggered when used by the general population in varying scenarios.
Source: /r/apple (Reddit) via Apple Insider, SlashGear