President's Council on Physical Fitness and Sports. Extensive information and resources about health and fitness from the government. 

Get Moving!

The American Heart Association's site for achieving physical fitness.

Healthy Weight: Assess Your Health Risk
The National Heart, Lung and Blood Institute's site for determining healthy weight. 

Weight Control Information Network
The National Institute of Diabetes and Digestive and Kidney Diseases' site for choosing a safe and successful weight-loss program.
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