Instruction of the Rhythm of the Approach Run

The purpose of this study was to examine the efficiency of the instruction focused on the rhythm of last three steps in the approach run in the long jump class and the high jump class of junior high school. The unit of 7 long jump classes and 8 high jump classes were focused on the rhythm up last three steps in the approach run, and the take-off movement in the first class and the last class were compared kinematically. Subjects in this study were 1, 2 and 3 grade junior high school students, the number of students in the long jump class was 17 and that the high jump class was 22 . To evaluate the take-off movement quantitatively, two analysis items were used. In long jump, takeoff index which is defined as the value of the vertical velocity at take-off divided by the deceleration of the horizontal velocity during take-off movement, and in high jump, velocity conversion rate which is defined as the value of the vertical velocity at take-off divided by the horizontal velocity at the starting point of take-off