Abstract
This study described a male university triple jumper who held the record in the second half of 15 m and achieved an active landing by improving the swing action of his free leg using a box practice, which increased his stepjumping distance. As a result of the box practice, his record increased from 15.81 m(+0.1) to 15.82 m(+0.6), while the jumping distance and jumping ratio remained almost unchanged each time. Comparing the athlete’s top three attempts before and after practice, it was noted that his step-jumping distance and step-jumping ratio after practice were higher than his highest values before practice (4.32 m(27.3 %)). On the other hand, the difference in his movement before and after practice was whether the lower part of his free leg was almost parallel to the ground at the start of the active landing. After practice, the athlete’s step take-off was improved by a swing action with the lower part of the free leg almost parallel to the ground. Based on our findings, to achieve an active landing, it is important to ensure that the preparatory posture of the free leg is appropriate before the start of the scissors action, rather than focusing only on the scissors action just before take-off.
