I went to a class that talked about it and then we practiced on the skin between the thumb and pointer finger and noted the results. They also showed us a device which could be purchased from the Apotheke which you inserted and blew up (Midwife didn't recommend it though - phew).
Usually only mums were supposed to be in this session but my DH was the only man in the class as he was supposed to be translating from German. After DS was born he was like - but did you do the massage thing? and I was like, well if I'd made it to 36 weeks I might have. I was told that with premmie normal delivery the schnitt is standard. Thankfully it wasn't as big a deal as I feared it would be.
What is popular her for low intervention birth is acupuncture. Will definitely give it a go next time.