Optimise your fitness in 10 different ways
You might consider yourself to be fit because you can run for a long distance without tiring, but then describe yourself as unfit when faced with a higher intensity bout of exercise such as lifting or circuit training.
In everyday life this might mean something as simple as running upstairs or carrying heavy loads in from the car. A high intensity activity which your body is not used to can leave you feeling exhausted when you would usually describe yourself as 'fit.'
This is because there are many components of fitness, many people excel at one or two but lack greatly in others.