I have the old version of The Firm with the "fanny lifter" box step things. You do see results in 10 sessions because it is quite a workout. Mine came with a calendar that told you the order to rotate the videos.
The main problem I have with it is it is very hard on my knees. After years of doing cheerleading jumps on a basketball floor my knees can't take all the lunges and such. I started fast forwarding those parts and that did slow progress down.
I think you will like it and who can beat getting SR credit for it!
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