Question

I ran the obstacle course in record time---------change into passive

Answer 1

in record time, i ran the obstacle course

Answer 2

I ran the obstacle course in record time.---->Active Voice. Here the doer,i, e, "I" is highlighted.

The obstacle course was run by me in record time.--->Passive Voice

We changed the tense of the sentence from Past tense to Past Perfect Tense. And we bring the work done by "I" before the subject "I"