[healthwork, recs] wearable devices

Alright. So. I have decided that I am interested in gathering More Data On My Physical Manifestation. In particular, I am interested in (1) biofeedback shenanigans with my heart rate, (2) sleep tracking, and optionally (3) a Big Data approach to Activity and Blood Pressure and... Things. In csv. (Oh, and (4) making it possible to suppress any and every piece of information related to estimated calorie use.)

... I would also like this hypothetical device to, while being able to give me real-time display of my heart rate, have enough of a battery life that I don't gotta charge it every day, and ideally not go around a wrist. I'm absolutely fine with having a simple old-school 90s digital watch-style display! I don't need it to be super fancy and touchscreen and multi-coloured! And even so I... sort of suspect that this Ideal Device is not yet a thing that exists in the world (even ignoring the part where I also have a mild preference for my biometric data not all getting uploaded into a Big Tech Cloud Service by default). But, just in case, is there such a thing?

And, in the inevitable case that there is not, do you perhaps have a recommendation for something that meets at least some of these criteria?