It's been awhile since I've done either, but the Firm produced great results for me. I know the programs have evolved over the years so I could be wrong, but it almost seems like you're comparing apples to oranges. I was not a fan of Billy Blank's style but if you like it, I think it is good cardio. The Firm that I liked was more of a strength training program. When I did that consistently I got a lot of comments about how I looked like I lost weight, so I think it's great for creating that lean look.
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