Find indomitable spirit in your heart

"Find Kokoro, or heart – Kokoro means indomitable spirit, and simply means to refuse to accept defeat.By being pushed, or pushing oneself, to the point of conquering your fears and any situation. Make never giving up a habit. Attack challenges put in front of you. These include not only the challenges on the mats, but the challenges of life."

The term is a compound of ki (気) meaning energy,
ai (合), an emphatic marker, unite.

Kiai is (気合) striking with united energy.