Louise

How would I go about starting to learn them?
I want to do it properly as to not ruin my back, but I want to learn them pretty soon so I can start to work on my flexibility.

I've found some videos to show dancers I've seen do them:

at 1.50 she does one there



and at 2.20:

Sorry for adding videos as it may seem a bit patronizing, but I understand there are different types of backbends?...

Anyways how do I learn them without causing any damage to my back?

xxx