Comments on: 15 Minute Killer Cardio Challenge For Women http://www.simplyshredded.com/15-minute-killer-cardio-challenge-for-women.html Fri, 10 Feb 2012 02:40:35 +0000 hourly 1 http://wordpress.org/?v= By: Red http://www.simplyshredded.com/15-minute-killer-cardio-challenge-for-women.html/comment-page-1#comment-122370 Red Thu, 31 Mar 2011 02:34:25 +0000 http://www.simplyshredded.com/?p=6186#comment-122370 how many reps or sets do you do of each? how do you know when to switch? how many reps or sets do you do of each? how do you know when to switch?

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