What is shredding ?

Its a DVD by gillian michaels(of biggest loser fame)that gives you a 30 day workout(toning).Ive just ordered the dvd and am hoping to start it next week if it has arrived by then.
 
Jillian Michaels 30 Day Shred dvd, it's 3 levels of (under) 30 minute workouts with abs, cardio & weights that give you really good results when you do each level 10 times.
 
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