Endurance athletes can be fanatical about separating their sources of nutrition: They want to separate the hydration from the electrolytes from the calories so they can piece it back together in a formula they've hashed out over time. Casual runners should be equally concerned about nutrition, too, if they want to see improvement from their training and feel healthy throughout. Nuun tabs are sugar-free, calorie-free, and contain electrolytes (sodium, magnesium, potassium, calcium) that the body needs to regulate hydration and keep muscles working properly, avoiding cramps associated with electrolyte imbalance. Just drop a tab into a water bottle and it becomes a sports drink. We like the Kona Kola flavor. [$24; nuun.com]
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