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.
Here you go
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The cerebrum- it fills up most of your brain, it is involved with remembering, problem solving, thinking, and feeling.
The cerebellum- is inthe back of your head, under the cerebrum. It controls your coordination and balance.
The brain stem- also beneath cerebrum, controls messages between brain.
I think the word is Biomagnification
