The U. S. has been in a severe heat wave. For the last 10 days or so it was in northern California and the northwest, and now it's moving east.

I was traveling up the coast last week and much of my exercise is outdoors—especially cardio. Do you exercise outdoors in this heat?

Many of you want to keep working out because it's part of how you keep our optimal performance: it keeps your energy and your mood high; it regulates your sleep, digestion, metabolism and more.

If you're an outdoor exerciser you can keep up your routine—with a few modifications.

Some of these you'll already know but they're a good reminder. Others, you may not know, or may have forgotten.

For example, did you know that your hydration needs to start long before your workout?

And also, did you know one of the signs of heat exhaustion and heat stroke is dizziness and confusion?

Heat exhaustion and heat stroke doesn't only happen if you're working out in the heat. It can happen to anyone with prolonged exposure.
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