Why are you exhausted after a day in the sun?

You’d think a day spent lounging on the beach would be the ultimate recharge. No deadlines, no emails, just rest and relaxation. And yet, by the time you head home, you’re wiped out. Not just relaxed, completely drained. It's supposed to be restful, so why does it feel like you’ve just run a marathon in flip-flops?

It’s not just the sun, it’s the heat, the humidity, and the work your body puts in to stay cool. Even when you're lying still, your internal systems are hustling to keep your core temperature around 37°C. The hott...