What is considered the best source of hydration after physical activity for most adults?

Cool water is widely recognized as the best source of hydration after physical activity for most adults because it effectively replenishes lost fluids without adding unnecessary sugars, calories, or other additives. After exercise, especially if it's moderate to intense, the primary aim is to restore hydration levels that may have decreased due to perspiration. Water is sufficient for this purpose, as it hydrates quickly and efficiently.

Sports drinks, while useful for prolonged physical activity lasting over an hour or in high-intensity exercise settings, often contain added sugars and electrolytes which aren't always necessary for casual exercisers or those engaging in moderate workouts.

Juice tends to be high in sugars and calories and may not provide the immediate hydration needed after exercise. Additionally, while coconut water does offer some electrolytes and can be hydrating, it may also contain calories and sugars that could be unnecessary for post-exercise recovery for average adults.

In summary, cool water is optimal for rehydration due to its purity, lack of additives, and appropriateness for the needs of most adults engaging in regular physical activity.