[1]Graduate School of Comprehensive Human Sciences University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8577 Japan;
[2]Faculty of Sports Sciences Waseda University 2-579-15 Mikajima Tokorozawa Saitama 359-1164 Japan;
[3]Faculty of Health and Sports Science University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8577 Japan;
[4]Institute of Health and Sports Science Kurume University 67 Asahimachi Kurume Fukuoka 830-0011 Japan;
[5]Faculty of Modern Life Teikyo Heisei University 4-21-2 Nakano Nakano-ku Tokyo 164-8530 Japan;
Local muscles; exercise intervention; surface EMG; core stability exercise; feedforward;