Hold the pedal of the jump bar with both feet, hold the handle of the jump bar with both hands, and keep your body upright. The force should be vertical. Don't move too much from front to back and from left to right. Jump on the flat, clean, open and hard ground. Don't jump too many times each time when children play horizontal bar jumping, so as not to damage joints such as knee joints. It is best to be accompanied by an adult.