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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FEATURED: DIET & FITNESS
Which activities burn the most calories?

Strengthen your core with these abdominal and lower back exercises. Our illustrated instructions guide you through each exercise, step by step.

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What's the worst fad diet ever?

If fads were made to last, we'd all have Chia Pets. Fad diets are a lot less fun -- and a lot more dangerous. Here's a look at a few diets that are worse than weight gain.

Body Mass Index

The number on the scale alone can't tell you whether you're at a healthy weight. Because height is also a factor, scientists came up with a mathematical formula called Body Mass Index (BMI). Learn how to calculate your BMI.

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