I'm still using & loving the DB Cardio Series & am quite certain that I have benefited from them in both visible & functional ways. However, I also use several other different dvds so I can't attribute my progress to them alone. Moreover, my hard work is always helped or obscured by my eating, ALWAYS.
I know this response isn't very helpful but I do suspect it's the same answer most of us will give you. That said, I actually look forward to my workouts with this new series & I do feel that it's been helpful.
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