If you ask any body builder how they became what they are, they’ll tell you it was by constantly challenging their body through their workouts. You may not have aspirations to be a competitive bodybuilder, but their logic works in any areas of life. If you want to change yourself, then you have to step outside your comfort zone. Lift the heavier weight, run the extra distance, swim that extra lap. Push yourself, push your body and mind and they will rise to the challenge.