When the children will autonomously play sports games are foot sports games, such as walking, running, jumping and so on these actions to constitute, but the single lever is the need to feet off the ground with the strength of the hands to support the weight of the body, or with the stomach and feet to support, when the feet off the ground the body in the air, which is the first time contact with the children, the body and mind will feel uneasy and fear, I think for the height of the children of kindergarten. I think for the height of kindergarten children, it is more suitable to lower the height of the bar to 70 centimeters, and the soft cushion must be placed under the single lever in case the child lets go of it, and will not be afraid.

For children in middle school, if they stand in front of the bar and raise their heels, their navels will be as high as the bar, so it will be easy for them to roll over when their hands are tightly gripped, their heads tilted forward, and their centers of gravity forward. When the child is rolling over, the teacher who is instructing the child must be very careful, and the child's hands must hold the bar tightly or help to hold it together, as it is very important for the child's safety.

You can get it from a single lever game:

Balance sensory rhythms with time-sensitive tuning forces.
Develops the joint muscles of the back, chest and shoulders.
Because of the many changes in the air, it can stimulate the central nervous system.