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A sky jumper exercising abdominal muscle automatic by pump.
A sky jumper exercising abdominal muscle automatic by pump.
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机译：跳水运动员通过泵自动锻炼腹肌。
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摘要
This is a children's playground equipment, which is called a sky jumper, and jumps up and down with the help of a spring, and its design is to use the elasticity of the spring when the body is raised after strengthening the spring for adults to enjoy. It is an exercise equipment that can strengthen the waist and abdominal muscles and correct the waist at the same time by compressing the belt that is attached to the waist by operating the pump.;The reason for the correction of the waist is that the body is not relaxed when the body is raised and the body is in a relaxed state. At this time, it may be useful in that the abdominal muscles and the waist can be strengthened while tightening the waist.
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