This Common Drug Makes Working Out Easier & More Fun

A version of this article originally appeared on Shape. As you probably know, caffeine is one of America's favorite drugs. While some might cite the negatives -- headaches, poor sleep -- it actually offers quite a few benefits, too, particularly when it comes to exercise, it turns out. Caffeine makes you more alert, focused, and, as any morning-latte addict will attest, it gives you a serious energy boost. But few realize how it can boost your workouts, too. While it might seem like water is you...