System: You gave me gymnastics at the beginning, and then you sent me through time?

When Xu Huai, an ordinary office man, was forcibly selected by the system, he was given the first task. If he didn't do it, he would be ten centimeters short. The reward was only radio gymnastics that everyone could do. Before he could complain, he was sent to another place. In a world where he has become a useless general of a country, there are countless people who want to kill him, but the emperor actually ordered him to fight all the way back to the imperial capital from the border. Where should Xu Huai go? "System!! Why did you trick me again!!!"...