... now. They are very intense workouts that are used to get you into shape quickly. Included in this group are Crossfit, P90X, Insanity and others. And they definitely deliver on the promise to give you a great workout, but for some they are also ...
http://www.9news.com/rss/article/356888/188/The-dangers-of-extreme-workouts
http://www.9news.com/rss/article/356888/188/The-dangers-of-extreme-workouts
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