Is there anything that coffee can’t make better? We haven’t found it, and even recent research from England has discovered that caffeine can make cardio enjoyable, or at least less unpleasant. British psychologists gave 12 athletes six milligrams of caffeine for every kilogram of body weight and then had them cycle for 90 minutes. (This is a very big dose, by the way — about twice what you get in a typical pre-workout formula.) Researchers monitored the athletes and found, as predicted, that caffeine reduced feelings of exhaustion. The scientists also noted that the subjects were less unhappy about the cardio workout with caffeine than they were without the caffeine. While these two factors might be the sides of the same coin — you tend to be less happy when you are suffering — it helps further explain the performance-enhancing powers of caffeine.