Yin Yoga

I signed up to a free trial at yogaglo.com.  I've been looking for something to improve my flexibility.  I did a couple of the classes, but unfortunately they didn't seem to do anything.  I think I'm a little too tightly strung for Yin yoga.  It was still a fun process.  I made a couple of yoga blocks by taping books together, and got some nice relaxation going for a couple of hours.  I might try it again just to make sure that it's not for me, because I'm still looking for something to improve my flexibility.  Shoulders and hips are the real weaknesses at the moment.  I need to open them up for a few poses.