It's summer, and before you know it, you may be in a situation in which you are super-duper hot with no air-conditioning in sight. What do you do now? A heat-related illness can spring up in a hurry, so it's vital to cool down ASAP, as some of these conditions can be deadly.

If you have to be active in the heat, don't go all-out immediately. Dr. Bert Mandelbaum, a sports medicine specialist and cochair of medical affairs at Cedars-Sinai Kerlan-Jobe Institute in Los Angeles, tells SheKnows that it's better to work your way up to the desired activity level.

"It's vital for anyone who's going to be exercising in extreme heat to work up to it slowly so your body has time to acclimate to the conditions it's being put to work under," he notes.

Of course, it's easiest to dash into an air-conditioned building or plop in front of a fan, but if you're feeling muggy and there is no AC oasis in sight, these tips can help you cool off until you can find that temperature-controlled indoor bliss.

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