WHAT'S INSIDE: DIET & FITNESS

HowStuffWorks offers guidance for developing an exercise routine that will help you get in shape and stay healthy. Learn about diet and fitness and get tips from professional trainers.
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Which activities burn the most calories?

The first marathon runner, Pheidippides, ran 26.2 miles to Athens to deliver an important message. He then fell down and died. Learn more about combining errands with your exercise routine.

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