Need to save the world

Part title

Ezra was having a good day, until lunch. He was getting up from his table, when something shot right into his neck. He then blacks out.
When Ezra woke up again, he was in a building that should've been an abandoned factory, but instead it looked like a multi-sport gym. In the middle was a boxing ring. All around the boxing ring were all different types of exercising machines. Jacob was in his office when he heard Ezra wake up. He let Ezra take in his surroundings before he got Ezra up and start his training. After a few minutes, Jacob walked up behind Ezra and put his hand on his shoulder. Suddenly Jacob's on the ground, not knowing how he got there, with a deep ache in his back.
When Ezra felt a hand come down on his shoulder he just instinctively flipped whoever it was over him, onto the ground. When the action was finished, Ezra was stunned because he'd never done it before, and he was scared that something was going to happen to him and if he was going to be abused by the man he just flipped.
"Well I didn't expect that to happen" Jacob said to no one as he got off the floor, looking at Ezra, "who are you? What do you want with me?" Asked Ezra. "Well, who I am is an easy answer I'm Jacob Stile, and I'm your trainer, Ezra" replied Jacob. "But why do you have to train me?" Ezra asked. Jacob didn't answer, instead he motioned for Ezra to follow him, and that's what he did.
Jacob lead Ezra to the boxing ring and told him to get in which he did with no complaints. Jacob went in after Ezra, ready for the lesson.
When Ezra looked ready, Jacob grabbed a bag and threw Ezra some gear and got himself some as well to put on. When finished, Jacob turned around and said, "you are going to keep training until you can beat me in everything I set for you, then I'll tell you why you had to train. Now let's start."
A whole year and a half went by without Ezra noticing, until finally, it was time for Ezra to know why he had to do this. "Ezra, the reason you were training for is a war that could destroy the world, and you are ready to fight." Jacob told Ezra. Ezra went to war with his comrades. The war was horrible for Ezra lost all his comrades with only him surviving, when the war finished and Ezra won he jumped onto a plane to see his family to tell them he had just saved the world.