Without using drugs or coffee or any nerual stimulant, what can I do that could increase blood flow to my brain permanently so that I can keep it sharp and alert. When I drink coffee I noticed a heightned sense of focus and "intelligence" if you want to call it that.
But what can I do to acheive the effects of coffee or drugs without using them.
Would simply subjecting myself to more puzzles or brain teasers force my brain to function more, they say the brain is a muscle after all. Or would exercise help create a better blood flow allowing me to focus when I need to.