A good idea what one could do in the off-season (considering one would do seasonal sports such as skiing) would be to either engange in activities that will preserve fitness - b, or to relax and recuperate; depending on the desire and wishes of the person - a.
True, withdrawal means the removing of a substance from someone’s body. Such as Nicotine Withdrawals. People who stop caping after doing it frequently get withdrawals such as tics and not being able to focus. This is because the substance is being removed from the body after the body was adjusted to it.