I had heard about this program for years and years (Callanetics first came out in the 70s, I think). It wasn't until I came across the Callenetics tape at a rummage sale that I actually tried it. If you can find Callanetics or AM PM Callanetics -- GET IT! I have tons of videos and not one of them has given me the results I wanted in such a short time. For once the claim of visible in results in a short time is true. Both Callanetics and AM PM Callanetics are very similar (a roughly 40-minute series of movies involving tiny pulses of various parts of the body). AM/PM is the same workout split up into two 20-minute workouts with one extra stomach exercise. You will feel the exercises (especially the hip and thigh ones) and see their effects in a day or two. The Abs have always been my trouble spot and it is taking a little longer to see the difference, but it is indeed coming. And it is not making me bulkier, like the Firm did, but leaner. I also am more flexible.
These came out in the 70s and 80s so the clothes, hair, make-up and music are dated, but after the first time, I didn't notice.
I'd recommend getting a Callanetics book, if possible (there are several, check ebay or Amazon for books and tapes.)
I do also have the Lotte Berk DVDs, which are apparently based on the same method as Callanetcs (indeed, I understand Callan Pinckney learned the moves from Lotte Berk) and they are good too. But for me, for whatever reason, I am seeing the results a lot more quickly.
So, in case you didn't figure it out, I highly recommend Callanetics.

Instructor Comments:
She is 47 (in Callanetics) or in her mid 50s (A.M./P.M. Callanetics), now in her 60s or so. She has a tremendous figure and agility, especially for her age. She has a very calming tone and is very encouraging: "Just do what you can do."

Laura