From the "Hoshizuna no Shima, Watashi no Shima" movie, starring 6th gen (2003). [This is my interpretation, I don't know Japanese] This scene is where the lady in the blue shirt is teaching basic gymnastics to a group of beginner students. Eri's character, Monami (?), gets impatient and wants to actually do something. So the lady points out the vaulting horse and Monami proceeds to do a flip off of it [[STUNT DOUBLE!]] surprising everyone. Sayumi is also in this scene (pink shirt).