This study highlights the success of a Japanese junior female 100m hurdler (personal best of 13.42 sec) through a case study. She had a habit of kicking leg motion and too tight an arm swing while running. Thus, the theme of the training program was to improve her kicking leg motion and her arm swing. The training was conducted over the AprilOctober season, which was divided into two terms—the first (Apr-Jun) and the second (Jul-Oct) semesters. The training goals were set for 3–4 weeks, and the overall target was to win the under–20 (U20) National Championships in October. The main results were as follows: 1) A significant decrease in the second-semester timing of the 100mH record compared to the first. 2) A significant decrease in the second-semester value of body fat percentage compared to the first. 3) A significant increase in the second-semester value of lean body mass compared to the first. 4) Improved kicking leg motion in the second semester. 5) Extended acceleration in the race.
    As a result of improving the kicking action, she succeeded in changing her race pattern and won the U20 National Championships.