I've heard that before. The new-er of the Biggest Loser workouts actually uses that idea. Lots of weight training is combined in with their cardio. The idea behind it is that the more muscle groups you use at once the more calories get burned. Plus by building up your muscles you'll be burning more calories at rest.
I used this workout my first go round, but it made me really sore. Really, really sore, to the point I dreaded the workouts, so take your time. I started at 30 minutes. Maybe do this for only 30 minutes than take the extra 30 for a different cardio activity till you build up.
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