YOU SAID:
i have been training my sprint for this marathon
INTO JAPANESE
私はこのマラソンのためにスプリントをトレーニングしてきた
BACK INTO ENGLISH
I've been training sprints for this marathon
INTO JAPANESE
私はこのマラソンのためにスプリントをトレーニングしてきた
BACK INTO ENGLISH
I've been training sprints for this marathon
That didn't even make that much sense in English.