Runners love a cup of pre-race joe for the pep it puts in their step. “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., sports dietitian with Ochsner’s Elmwood Fitness Center in New Orleans. Try it iced or hot a half hour before a gym sesh, but if it upsets your stomach, push it back to an hour. Not crazy for coffee? Iced or hot green tea works too. Feel free to add milk, but skip the sugar, which can negate the caffeine kick.