I found this DVD simple and effective. The fact that she is over 80 years of age and still teaches just RAWKS! Talk about keeping you young :-)
Here is more on it.
I teach Yoga and have been doing Pilates off and on for years.
As a matter of fact I added a reformer if you recall this year and the Malibu Pilates chair to my studio. Not only does it focus on core but I feel like it makes your whole body feel better. That's worth the money right there!
Insanity Day 18