... are strict and difficult and had to achieve for most typical people. Your average person starting out with weight training will not achieve this, especially with the "toning" protocol of light weights and high repetitions. That is muscles endurance ...
http://www.examiner.com/article/what-is-toning?cid=rss
http://www.examiner.com/article/what-is-toning?cid=rss
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