Updated: Mon, 05 Dec 2011 15:33:24 GMT | By Tom Fortune
Nine fitness rules that were made to be broken

I should always do 12 reps



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For some reason, when lifting weights or doing exercises like sit-ups, we have been conditioned to think the optimum number of repetitions is between eight to 12. The truth is, though it isn't detrimental to the body, this represents a medium amount of exertion for your muscles, and an increased amount of tension would, therefore, help your muscles to grow faster.

As soon as you are comfortable with moving up a gear, begin to vary your repetition lengths to keep your muscles guessing - and say goodbye to the dozen reps that have been keeping you on that plateau for years.

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