Gretchen Reynolds has been writing about personal wellness for more than a decade. She was the health and fitness reporter for Runner's World and Bicycle magazines, and is now a frequent contributor to Oprah Magazine and Women's Health. Her Phys Ed column is one of most read and shared columns in the New York Times. 

In her new book, "The First 20 Minutes: Surprising Science Reveals How We Can Exercise Better, Train Smarter and Live Longer," Gretchen explains how little exercise you can do in order to reap its benefits.

She says there's a very strongly entrenched myth that you have to do a lot of exercise for it to mean anything, but a growing body of research and evidence shows that even small amounts of activity provide enormous health benefits, Gretchen says. 

As the most sedentary society that's ever lived on Earth, Gretchen says it's more important than ever for people to get moving. Our bodies were designed to move, and when they stop moving, the chronic diseases attack. 

If you're not ready to hit the gym, Gretchen explains how movement doesn't have to mean "exercise," particularly if the "e" word keeps you from getting started. She offers alternative and fun ways to get your body moving. 

Plus, find out why she believes you get most benefits in first 20 to 30 minutes of activity, whether you're easy, moderate or vigorous workouts. 

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