3. Dress properly
Wear loose, lightweight and light-colored clothing to help keep the heat at bay. Add a light, broad-brimmed hat and sunglasses, if possible. Do not forget the sunscreen -- which you should regularly reapply -- as a sunburn can be dehydrating, plus it hampers your body's ability to cool down.
4. Acclimate to the heat
Just as you need to acclimate your body to a higher elevation, you also need to help your body adjust to the heat, especially if you normally exercise indoors or in cooler weather. Acclimate by shortening your workouts and lowering their intensity for a week or two once it's consistently hot outside.
5. Stay hydrated
Being well hydrated is key to preventing heat illness, whether you are exercising outside or sitting around indoors. So keep tabs on your hydration level at all times. The CDC recommends drinking eight ounces of water every 15 to 20 minutes when you are out in the heat.
To achieve this, carry water with you and drink regularly, even if you are not thirsty. For once you find yourself thirsty, you are already at least slightly dehydrated. If you struggle to down water, try a sports drink instead. Or eat some fruit.
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