The best fluid to support physical activity for endurance athletes who exercise for longer than one hour is:

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Sports drinks are the best fluid to support physical activity for endurance athletes who exercise for longer than one hour as they contain electrolytes (such as sodium and potassium) that are lost through sweat and need to be replaced to maintain fluid balance and prevent dehydration. They also contain carbohydrates, which help to fuel the muscles during extended exercise. Plain water lacks both electrolytes and carbohydrates, which can be detrimental for endurance athletes, especially in hot and humid conditions. Saltwater mixtures may cause further dehydration and are not recommended. Lukewarm water is less effective at cooling the body than cool water. Caffeinated liquids can have a dehydrating effect and may cause gastrointestinal distress, making them less ideal for endurance athletes.

The Best Fluid to Support Physical Activity for Endurance Athletes