The development of a physical strength improvement program which a child student is equal to itself grapples with-Pay attention to the G ball movement-

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Bounding motion in a seated position on a G-ball for children was observed with the aim of obtaining a basic knowledge of the effect of the G-ball motion on the children 1 s sitting-posture. Dynamical and mental reflective analyses about the change in the posture before, after and during the motion were attempted.The results are as follows.1. The average tempo of the bounding motion for all the subjects was 109±6.2 bounds/minutes. Separately, it was 108±6.4 and 111±6.3 bounds/minutes for males and females, respectively. There was no significant difference.2. The average value of BED (Back-Ear-Distance) in the sitting posture before and after the bounding motion was, 18.3±3.71 cm and 17.1±4.04 cm, respectively. It significantly decreased (P<0.01). Separately, BED significantly decreased both for males and females, but the decrease was more apparent for males (P<0.01) than for females (P<0.05). The average values of BED before and after the bounding motion for hump-back group were 21.8±2.53 cm and 20.3±3.84 cm, respectively. Those for the middle group were 17.3±0.96 cm and 16.3±1.57 cm. Both groups showed a significant decrease after the bounding motion (both groups P<0.01).3. Both the values of BED at the highest and the lowest positions, averaged for every 15 bounds, showed a significant decrease as the number of bounds increased (P<0.05).4. Mental reflection investigation executed after the exercise showed that 94.1% of the children gave a favorable answer.