How to move my hips in missionary?

How to move my hips in missionary? How to move my hips in missionary? 23F here and I’m trying to learn how to roll or lift my hips properly when I’m on my back for my bf instead of just staying still. It feels like it should be more of a rocking motion but I’m not sure how to do it right without getting tired fast. Can’t find any good tutorials anywhere. If anyone can help, please do.