Personally, I find improving flexibility one of the toughest things to do because it takes a lot of time and patience - two things that the majority of us don't have (#amiright?!). I really haven't found any way around that (sorry!), but using props like yoga blocks is definitely a way to work on your flexibility if you feel like you've hit a plateau.
Yoga Teacher Talk is a new series that discusses everything related to teaching yoga. I’m hoping it will be a great resource and conversation start for current and prospective teachers. Make sure to pop on over to the Yoga Forum, where we’ve got a whole section dedicated to yoga teachers.