Carrying four bags of shopping in from the car in one trip is not something anyone celebrates. It gets done irritably, usually, and forgotten by the time the kettle is on.
Health is made almost entirely of things at that scale, and it is invisible while you have it. Anyone who has been temporarily unable to do the one-trip version can describe exactly how much was going on inside it.
Gratitude here is not an obligation and nobody is owed it. It is only the noticing, done today, while the thing is still ordinary enough to be boring.