The purposes of this study were to observe the kinetic chain in attack leg and the ground reaction force (GRF) of support leg in jump back kick. Seven male Taekwondo athletes (age: 21.0 ± 2.2 year old; height: 180.4 ± 4.4 cm; weight: 77.7 ± 13.2 kg) were subjects. Two Redlake cameras synchronized with a Kistler force platform were collected the GRF data. Kwon 3D analyzed the kinematic data and KwonGRF analyzed the kinetic data. The results indicated the attack leg was not following kinetic chain during kicking phase whereas the knee and ankle angle support leg were from extension to flexion. The GRF of support leg was the peak vertical force appearing before the peak horizontal force during rotation phase. When subjects kicked the bag, it reached to apex of center. When support leg utilized toe rotation, the center of pressure (COP) of medial-lateral had more displacement. However, the COP of anterior-posterior shifted forward and increased the displacement.
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