Move 2 to the left and 2 to the right, suitable for girls. As for the fastest and most labor-saving, it is very simple, the front plate is the largest, and the back plate is the smallest and fastest; The smallest plate in front, the biggest plate in the back is the easiest; Friendly reminder, you can't stand in the front, but stand behind. Similarly, you can't have the smallest gear to the smallest gear. Otherwise, it will cause serious losses to the transmission system. By the way, some transmissions have different gear numbers. I don't know whether your gear is the highest or the lowest, so I'll just say the gear size, purely by hand. I hope to adopt.