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Capacity

What it is. The Workbench’s estimate of how much your body has available today — built from your recent sleep, overnight physiology and accumulated training load. How to read it. Higher means more in the tank. But the useful reading is the direction: three days of falling Capacity says something, one low morning does not. What it needs. A device worn overnight that reports HRV and resting heart rate, plus a few nights of your own history to compare against.
“Needs HRV” means exactly that — the overnight HRV reading has not arrived. Usually the device has not synced yet, or was not worn. It often resolves itself once your wearable catches up.
A caveat we owe you. Capacity is in its calibration period. The number is real and built on published science, but the weights behind it are still being tuned — partly against your data. Treat it as informative, not authoritative. Tap it for the Capacity screen.

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Metabolic Age

What it is. How your metabolism compares with population norms for your age. A metabolic age below your real age suggests a metabolism behaving like a younger person’s. What it needs. Weight and body fat percentage. Weight alone is not enough — the calculation needs to know how much of you is lean mass. If it is blank, you have not provided body fat. Either connect a composition scale or log it by hand.

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Vascular Age

What it is. How your arteries compare with population norms, estimated from blood pressure via a published method.
This needs no special hardware. One blood pressure reading, typed in, is enough — no Withings Body Scan, no Oura ring. Borrow a cuff, take a reading, log it.
How long a reading lasts. Thirty days. One reading a month keeps the card alive. If it is blank, there is no blood pressure reading within thirty days. That is the whole explanation.

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Cumulative Stress

What it is. Accumulated physiological load over recent days — the sum of what your body has been asked to handle, not just today. How to read it. Useful alongside Capacity. High stress with holding Capacity means you are absorbing the load. High stress with falling Capacity is the pattern worth noticing.