Part 1: Gina begins the lesson by explaining the importance of straightness to related and bending lines. She discusses relative straightness, and the rider's role in maintaining the straightness of the horse down a line, and being aware of drift. She has the riders try an exercise with a two oxers at a related distance. Many of the riders have issues with drifting, and Gina reminds them of the importance of keeping the horse straight with the leg. They work on adjustability of stride, and Gina discusses the two ways the riders can add - by either changing the shape of the horses stride, making more distance, or both.