I don&#x27;t doubt that exercise promotes a healthy brain, but I sometimes wonder whether the endorphin high of exercise is really the best preparation for the day at hand. Sure, you feel great, but are you thinking great? Or do you just <i>think</i> you&#x27;re thinking great?<p>In some of the cases described in this article, it sounds like these execs are addicted to the exercise that they wake up so early for (granted not a bad habit). But addiction by its nature tends to invent a narrative for its existence and the promise of greater productivity is gold.