Ive been having one on one Pilates (or Pirates as my partner likes to call it) for about a month now. I'd recommend it to anyone who is having pelvic, lower back pain. My whole way of walking, sleeping, sitting, running, biking, swimming posture has changed and for the better! No more back pain AT ALL and im able to stand up for long periods of time comfortably.
The exercises are moving further into core strength than the physio poses i was doing and get my glutes firing finally (my right one wasnt at all thus the back pain and the 'catching').