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Most of what we need happens automatically. There are four things we do need you to actually do.
1

Wear your devices the way you normally would

Not more, not more carefully. If you usually take the ring off at weekends, keep doing that. See Please do not perform — this matters more than it sounds.
2

Log a few things by hand, honestly

Weight, what you ate, how much you drank, whether you were ill. Log what is true, skip what you cannot be bothered with, and do not go back and tidy it up. A gap is a real answer.
3

Run Discovery and tap Send to VT, every week or two

This is the one job that is purely for us, and the one most likely to be forgotten. It takes about thirty seconds.
4

Tell us when something looks wrong

Preferably with a screenshot. Reporting a bug shows you the fastest way, and the feedback site is where longer thoughts and suggestions go.

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About that third one

Discovery is a tab along the bottom of the app. It interrogates each of your connected sources and asks: what can you actually give me? Which measurements, how far back, at what resolution, with what gaps. Then Send to VT transmits that report — the shape of your data, not a copy of your health history — to us.
Why we keep asking rather than doing it once: the answer changes. Your watch gets a firmware update and starts reporting something new. You connect a second device. A source silently stops providing something it used to. A single report is a snapshot; a series of them is the thing we can actually design against.
We cannot get this any other way. No amount of reading manufacturer documentation tells us what your particular watch, on your particular phone, with your particular sync history, actually hands over. Thirty seconds, once a fortnight. It is genuinely the highest-value thing you can do for this project.

How to run it

Discovery and Send to VT, step by step.