cupcakes please forgive any errors as just started learning about it, but from the class I understand the following about active birth:
It's about preparing your body naturally for the optimum birth and labour, including helping your body to help position the baby correctly.
So, she talked about where the baby should be positioned for the most effective labour - which is left occiput anterior - i.e head down facing your spine, body slightly to the left with its spine facing out. you cna see images on www.spinningbabies.com
She then went through how to encourage your baby to move into this position - birthing balls, sleeping/laying on your left, keeping your pelvis higher than your hips when driving and spending more time on all fours or at floor level (i.e do some cleaning! lol).
She also talked about labour positions, how the baby moves through your pelvis and how to position (again) for the baby to move most effectively through. For example, your septum/coccyx will actually lift during the final pushing stages by up to 1 inch, which is a heck of a lot of extra space for the baby to come out (!), so laying on your back for delivery stops that being possible...
Also discussed different hormones in labour - adrenalin inhibits labour (so fear/anxiety etc) and endorphins stimulate labour (calmness, naturally produced during labour)
She also did breathing exercises, talked about different experiences of labour and was generally very positive!!
so, key things I took away were:
Lie on my left
Keep moving around
try and be upright during active labour
and try to keep calm (probably easier said than done)
HTH