Fighting Spirit
noun
You have fight in you, and you have the intention to win. You have fighting spirit. Right? Right?! Show me your fighting spirit!
闘志 is a relatively formal word that you'll often see in writing about sports, business, or personal challenges.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
その戦闘ロボットは、メラメラと闘志を燃やしていた。
The battle robot was full of fighting spirit.