Does a pre-workout brew put a pep in your step? Yes, it really does! “Research shows that the caffeine in coffee can enhance physical endurance and stamina, making a long run or ride feel easier,” says Molly Kimball, R.D., a New Orleans sports dietitian. Embrace the hot (or cold) stuff just a half hour before your workout and feel the extra boost of energy running through your veins. But skip the sugar, otherwise you’ll be undoing the good effects.