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Reference devices:
ZMax + Dreamento: https://www.biorxiv.org/content/10.11... & https://github.com/dreamento/dreamento
Polar H10: https://pubmed.ncbi.nlm.nih.gov/31004...

Intro Music:
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Timestamps:
00:00 Quick Intro
00:57 Testing setup
01:24 Apple Watch 9 Improvements
04:05 Indoor Cycling Test 1 : Male
06:54 Indoor Cycling Test 2 : Female
08:05 Indoor Cycling Test : Comparison w/ Other Watches
09:38 Outdoor Cycling Test 1 : Male
12:03 Outdoor Cycling Test 2 : Female
13:06 Outdoor Cycling Test : Comparison w/ Other Watches
14:29 Running Test 1 : Male
15:51 Running Test 2 : Female
16:36 Weight Lifting Test 1 : Male
18:46 Weight Lifting Test 2 : Female
19:43 Weight Lifting Test : Comparison w/ Other Watches
21:44 Sleep Test : Series 9
29:40 Sleep Test : Comparison w/ Other Watches
33:25 GPS Test
38:31 Oxygen Saturation Test
41:11 Limitations
42:00 Recommendations & Conclusions

For the most part, the watch is very similar to the Series 8, but with a few improvements: first of all, the screen is quite a bit brighter, which is quite nice actually. It is quite tricky to capture on camera, but here you can see it for yourself under a bunch of different circumstances. Second, one of the main things that was addressed in the keynote is that it has a new and much more powerful S9 chip, which among other things enables the “double tap”. This was one of the most highlighted features during the keynote, maybe a bit too much in my opinion, but it is quite cool. This is available starting from watchOS version 10.1, which unfortunately isn’t out yet, and Apple did not invite me to the launch event or give me early access, so I couldn’ test it. Hey Apple, hint, hint… Now, online I saw many comments that Apple Watches basically had this feature for a long time, called Assistive Touch. I tried Assistive Touch on my Apple Watch Series 8 before the Series 9 was released, and it does have much of the same functionalities as Double Tap. Though I did find it kind of clunky to use. DC Rainmaker mentioned in his video that the double tap feature worked significantly better for him than Assistive touch. Now, Apple says the double tap feature will only work on the Series 9, because it needs the S9 chip, which is probably true for the way it is implemented. However, I still wonder if they couldn’t have made it work on older series if they’d really wanted to, but OK, it is Apple we are talking about. Now, the new S9 chip also enables Siri to do some new things: first of all, Siri can now process some commands on-device, meaning it is much faster at doing certain things, like setting an alarm. This is honestly much more important to me than double tap, since I will use Siri much more for these kinds of small tasks now. Siri can now also access your health and fitness data, and also add health data via voice commands, or at least, you will be able to do so “later this year”.