Hydration

When working out in the summer heat, make hydration a priority. Both high temperatures and humidity increase the body’s demand for fluids. When humidity is high — 60 percent or greater — sweat does not easily evaporate into the air.

In order to cool off the body, sweat must evaporate from your skin. The hotter your body gets, the greater your hydration needs become — and the greater your risk of heat-related illnesses.
Age can also reduce your body’s ability to cool itself. To stay safe in the summer heat, keep a close eye on your water intake.
 The color of your urine is a telltale sign of how hydrated you are. If it’s clear, you’re in the clear. Dark yellow urine is a sign that you need more fluids.
 Drink water throughout the day, even if you don’t feel thirsty. If you’re going to be working out, hydrate before you head out.