Extreme workouts part of a growing trend in gyms

... thanks to a seemingly never-ending techno beat of late-night commercials touting DVDs for such intense works outs as P90X and Insanity. P90X, which a promotional website describes as "sweat-inducing, muscle-pumping exercises designed to transform ...

http://www.sunherald.com/2013/08/08/4858276/extreme-workouts-part-of-a-growing.html#storylink=rss