Charlie Munger thought of exercise as adding mileage to the car.

Most people who talk about adding milage to a car have never tried to keep an old car running. Those who do have long learned that milage is a tiny issue, age is a much larger factor. They have also learned that low milage is a bad sign - what is wrong that you only drove it that much: often the answer is city driving which puts a lot more wear on the car than highway driving.