The local swimming pool typically has plenty of water, but swimmers and lifeguards still need to take breaks and drink water to maintain the hydration that is essential for health, said Mike Bradshaw, Kansas State University Research and Extension health and safety specialist.
On hot, humid days the body typically requires additional fluids, particularly water, to replace fluids lost through perspiration – the body's natural cooling system, Bradshaw said.
"Drink water before you are thirsty, though, as thirst is not always a good sign of dehydration," he said.
Replenishing sunscreen as needed, is also a good idea, because sunburn makes it more difficult for the body to cool itself.
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