Tip of the Week: Mix up your training routine often to get your body and your mind out of any ruts. More than a half-century ago, I came up with something I call the Weider Muscle Confusion Principle. The theory behind it is that the body, being the wonderfully adaptable machine that it is, begins to grow accustomed to stresses being placed upon it in a relatively short amount of time. This could be as little as a couple of weeks or as long as a few months. Regardless, once it does adapt, pro ...

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