Pilates and Yoga are wonderful disciplines but are often performed poorly. 
Pilates is taught on an individual basis targeted at the physical capabilities of your body. For example you are not required to stretch muscles that are already flexible. The area of focus in Pilates is the core strength which ranges from the pelvic floor to the vocal cords. A small group allows for the specific adjustments that you require. 

Real time ultrasound will show you how to perform core strength easily and effectively. This takes the guess work out of it!