Nicholas reviews the ride from the previous day, and they talk about why her horse is tiring sooner when she asks him to go long and low and carry himself.  They begin the work with a stretchy walk, keeping it down and flatter while he marches through his body.  They use flexion to the inside until he softens and lengthens his neck in both the walk and trot.  Nicholas has her rise farther in the posting to get the rhythm clearer.