Glad the link was helpful @hoochyhag and @Rummikub I often Google a shape in the hope I can get a better idea of how I should be doing it.
@happytobemrsg I think Move gets a bit easier in a bit - it is hard. I love Adriene and really appreciate what she does, but honestly I think these couple of days were maybe not the best put together. Don't feel bad if you have to adapt a pose, take a child's pose for a bit in between. You could go back to Center as suggested, or persevere for a few more days and see how you feel?
I do a trapeze class once a week. The increased core strength I've got from doing regular yoga since the middle of October has helped me loads. Apart from that I just do some walking. But I think a daily yoga practice, doing Center or Move (or one of the other 30 day things, but I dont know them), would probably be a really solid foundation for a healthy lifestyle.