In this study, they wanted to test “the effects of ingesting a performance bar, containing caffeine, before and during cycling exercise on physical and cognitive performance”. There were 3 groups, one that consumed a performance bar containing caffeine, another that contained a performance bar without caffeine, and another that consumed a placebo beverage. Each group cycled for a period of time and then they had the participants take a variety of mental tests where they were required to do things such as memorize a series of words or analyze data. It was found that the caffeine not only improved the speed during the exercise, but also improved the cognitive ability. This further justifies the numerous cups of coffee that the average college kid consumes on a weekly basis. So keep drinking! … Coffee, of course.