Active birth positions are very important. Not many people can picture themselves doing it but the key thing is to just glance at them and take it in. In labour your body doesn't need telling it just does it. But it takes repetition and practice so it becomes ingrained in your subconscious mind.
Why do we actively birth? Because it is natural. Try doing a poo lying on your back. It makes it much much harder and a bit of a struggle. When you use an active birth position your pelvis is up to 28% more open which leads to less of a risk of tearing or the need for an intervention. Use a door, use a chair, use your partner! Whatever it is just use it and go with what your body is doing and telling you.
You have to let go and trust in your body to move and do what it needs to do to birth your baby :)
Photo credit @spiritysol