Sure, water's a great hydrator, but sometimes you long for something more interesting.

Here are four sips that give runners what they really need—without adding gobs of calories. Fill in the blanks, and see which drink is ideal for you.

When I run I …
feel sluggish and tired

If this is you: Sip a cup of green tea 20 to 30 minutes before you run. The caffeine will pep you up and power you through to the last step, and its antioxidants may help with endurance, too.

When I run I …
always get a side stitch

If this is you: Try coconut water; it's chock-full of cramp-preventing potassium (15 times that of most sports drinks) and has fewer than 50 calories per cup. Try eight ounces before or during your run to stay pain-free.

When I run I …
get really sore the next day

If this is you: With its perfect ratio of carbs to protein—plus the calcium—chocolate milk is an excellent way to help your muscles recover post workout. Drink a cup within 30 minutes of finishing a long run, when muscles are most receptive.

When I run I …
sweat a lot

If this is you: A sports drink, with body-replenishing sugars and electrolytes, is the best way to stay hydrated. Choose one that's free of artificial colors, flavors and preservatives, and sip four to six ounces every 15 to 20 minutes during your workout.