This study reports a coaching case of a men's hammer throw athlete (abbreviated to “T athlete” after this) who had a problem with the acceleration of the hammer during the turn phase. T athlete’s personal record was 45.75m at the start of coaching. The theme of the training program was “hammer throw without using preliminary swings”. And T athlete practiced to accelerate the hammer during the turn phase. The training was carried out for about three and a half months. The procedure of the approach was divided into two stages. The approach ① was the 1st training process until T athlete learned “the hammer throw without using preliminary swings”. The approach ② was a training process after learning “the hammer throw without using preliminary swings”. During the approach ①, T athlete was able to learn the timing to accelerate the hammer from the right back during “the hammer throw without using preliminary swings”. In addition, the approach ② conducted the inclined plane of the hammer orbit of the actual throw to get closer to the one of “the hammer throw without using preliminary swings”. Finally, T athlete improved the personal record approximately 7m (45.75 to 52.67m). “The hammer throw without preliminary swings” is considered to be effective as one of the convincing training method to improve the turn technique of hammer throw.
