The brain is a muscle. As all muscles it needs training to keep in shape.
Personally I see the type of tasks you solve in an IQ test as one type of training, mainly for logical thinking.
Solving puzzles of different types trains other parts of the brain. Anything you are not already familiar with will start your brain cells working.
Moving your body in new unfamiliar ways by trying a new sport or dancing keeps other parts of the brain in shape. Here you have the added benefit of also training you mobile muscles.
Keep them grey cells busy!
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