A few things I would fix. Changed sentences are bolded.
My most meaningful commitment over the past four years would be cross country. It has definitely become the activity to which I have given the most amount of dedication because of the passion that I have developed.
I plan on continuing running after high school because it has become a large part of my life. My teammates and I share a bond that is exceptionally unique.
Only my teammates understand the dedication it takes to consistently work hard out on the trails day after day in order to reach our goals. As teammates, we push each other along during workouts and have respect for each other based upon work ethic.
I truly appreciate that in cross country, perseverance and consistency are rewarded over time. My experiences throughout my cross country career have taught me that hard work is rewarded and team is always more important than individual.A.H.