i popped into an ashtanga yoga class cause my right bicep was damaged so I couldn't climb... bicep almost fine and climbing, but stuck to the yoga... good for rest days from climbing, helpful for flexibility, core body strength, controlling anxiety, and general lifestyle stress relief.
Kurz book a touch pricey, so found this:
http://www.stadion.com/column.html. A bit info overload.
There's equipment out there for splits:
http://www.black-eagle.co.uk/maxi-flex-stretcher-p-359.html. Because the price puts me off, I ask someone to link wrists whilst I lower myself down whilst standing on my heels, legs split (hold 10 secs, lower,etc). Banisters, ballerina-style, also helpful.