Try to be ambidextrous. Use your nondominant hand to brush your teeth, comb, handle the mouse. Write with both hands simultaneously. Do the same with the knife and fork.
Learn new languages
Learn to enjoy things like paradoxes and optical illusions.
Make mental maps of your neighborhood, state, country.
Block one or more senses. Eat with your eyes closed, use earplugs, bathe with eyes closed.
Develop comparative tasting. Learn how to properly taste wine, chocolate, beer, cheese, etc.
