Health is a vehicle, and vehicles get judged by where they will take you. A year of running badly makes people conclude the journey has been cancelled.
It rarely has. It gets smaller and closer in. Somebody who ran a department for twenty years finds that the useful thing they did this week was a phone call to a nephew who needed one, and that call is not a consolation prize.
Whatever you are for does not require full capacity in order to be exercised. It requires some. Most weeks supply some.