I manifest sound health.

A fridge hums for years and nobody in the house has ever consciously heard it. The day it stops, everyone notices within the hour.

Health runs at roughly that volume. An enormous amount is happening right now — temperature, balance, an immune argument being won somewhere near your throat — and none of it is audible. Sound health is not a feeling so much as the absence of one. Notice the hum today, while it is still boring enough to ignore.