" and here was a truly pleasant surprise—they also got better at other things. The students who did the study-discipline program reported doing physical workouts a bit more often and cutting down on impulsive spending. Those in the fitness and money-management programs said they studied more diligently. Exercising self-control in one area seemed to improve all areas of life. "

― Roy F. Baumeister , Willpower: Rediscovering the Greatest Human Strength