i come here for weekly Pilates classes. They last 75-90 minutes. The classes contain a maximum of 4 ppl so the instructors have plenty of time to give me individual attention. Even though it's a pain in the arse to drive here from my house, i'm still attending classes on a weekly basis after 15 mths. I've had no further problems with lower back pain and have managed to stay injury-free despite running 4x per week.