I found this little sequence interesting even though it is only a very small amount of movement:

 

As Katie's arms move her back curves and arches slightly.

Also this captured movement was not meant to be part of the scene but the motion of Emma sat on the floor and twisting round is a good one to note:

 

Her arm arcs down first as her head starts to look around which twists the spine and the top half of the body. The hair then follows through in a secondary movement before the legs swing around correcting the spine. The weight balance shifts from being sat onto her hand. I found this interesting as it is a good example of a simple movement not having everything happening at one time as a continuous movement but something more complex when analysed.