While there's lots of beta on passive stretching for climbing in training articles, i've not found much on active stretching. Possibly because many articles focus on stretching for injury prevention/rehab, recovery etc. and not for increasing flexibility (a real need for me!).
About the only thing i have found is from Simpson's article on the moon site.
Anybody care to share secrets? (preferably routines that can be done at home and dont require a wall..!)