Go longer and stronger with Nuun Endurance. Designed using the latest in sports hydration research, Nuun Endurance contains the optimal blend of carbohydrates and electrolytes for the unique physiological demands of intense workouts. If youre pushing yourself to the limit or exercising for more than 90 minutes at a time, Nuun Endurance hydrates while minimizing GI distress so you can make every step and every rep count.