Training methods for the iliopsoas muscles

Westerners are said to have 1.5 to 2 times more developed iliopsoas muscles than Japanese.
The iliopsoas muscle plays an important role in connecting the upper and lower body, and is the reason why Japanese athletes have had difficulty winning sprint competitions.
However, in recent years, athletes have achieved good results and improved their performance by training the iliopsoas muscle.
and performance improvement by training these "iliopsoas muscles.
Mari Suenaga, the winner of the 2022 All Japan Women's Kendo Championships, focused on training the ilial psoas muscles.　　　　
As a result, she gained the muscular endurance to keep moving even in a long match and the instantaneous power to catch an opening in an instant.
He has also gained the power to seize an opening in a split second.
This video demonstrates and explains the training of "iliopsoas muscles" that Suenaga actually performs.