a) This photo taken at the beginning of their first lesson clearly shows tension in both Ewa and her horse. Ewa's arms are fixed against her body with tightness in her upper arm and shoulder region. She is in rising trot, but clearly behind the movement. Riders inadvertently pull on the reins at the start of every rise. This pulls in the horse's mouth causing defensive mouth behaviour, clearly shown by the horse hollowing her frame.
b) The second photo, taken at the end of the third lesson shows relaxation in both horse and rider in rising trot. Ewa's seat has been lightened, her upper body now in a slightly forward position to maintain her centre of gravity over the moving horse's centre of gravity. This ensures that she does not rise behind the horse's movement. With her clearly yielding contact, the horse has lost her tension as well as her defensive mouth behaviour.