What role does exercise play in weight management?

Exercise is key to weight loss and especially important to maintain weight once a desirable weight is reached. Aerobic exercise such as brisk walking, running, bicycling, swimming and aerobic fitness machine work, like stationary bicycling, is the best way to burn extra calories. Each activity burns a different amount of calories, but they are all good for eliminating extra calories and weight maintenance.
Strength training such as push-ups, pull-ups, stomach crunches, weight training, and strength building machines help to build muscle and bone mass. As muscle mass grows, the body burns more calories at rest, therefore, additional calories are burned all of the time as lean body mass increases. 
As the metabolism increases, more fat is burned over time, therefore it is easier to lose weight and even easier to maintain a lower body weight.
  

Here are some other sites:
exercise information  (pdf)
adults and exercise
physical activity

 

 
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