One of the ways you can “change” your brain is actually through thought itself. Your mental effort can actually result in physical changes to your mind and body.
Even thinking about exercise can increase your muscle strength.
For example, like playing the piano or exercising, research shows that many of the same benefits exist for imagined or physical actions.Those who mentally practiced playing the piano achieved the same accuracy level as those who physically did it.
People who simply imagined doing strength-training exercises increased their muscle strength by 22 percent, compared to 30 percent among those who physically did the exercises.
Now this doesn't mean you can simply sit all day and just think about exercising, but it does relate to the added success of mentally preparing for some thing rather then the negative thoughts that can hinder your success.
Serious athletes are successful not just because of their physical ability but because they are mentally prepared and fit.
When I work with new clients on their fitness goals, I can immediately tell who will be successful and who will fail. Their mental state about the work they will do sets the tone and success rate.
If you begin your exercise routine with excitement and strength you will get more from the work you put out. If you dread the work out and aren't motivated, then that's your end result.
Think positive, think success and you will achieve your goals.