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How to Work Out
Here's one of the keys to fast fitness - you want to maintain a persistently high level of metabolic activity every day. The best way to do this is to provide your body with two things – variety and challenge. It's not enough to follow an “exercise routine” where you always do the same exercise, the same way, at the same speed, for the same amount of time.
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The Principle of Overload
Muscles adapt and grow when they are forced (with proper form) to overcome a resistance they have not experienced before. In weight training, that's called the "principle of overload".
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