How do you say

He works out every day, and it has paid off in increased stamina over the last three months. Chinese?


tā měi tiān dōu jiān chí yùn dòng , yǐ jīng tí gāo le sān gè yuè de tǐ néng 。

How do you say "After three months of training, he came in first in the marathon." in Chinese?