I like putting up new personal bests.

我喜欢创造出新的个人最好成绩。

I know how hard the participants are trying to be their personal bests and how hard the volunteers are working to facilitate the participants to reach their goals.

我知道选手是多么艰难地付出自己最大努力，而义工是多么艰难地提供后援，支持选手实现自己的目标。