Identify the point of view - I ran up a steep hill. I was very hot and exhausted. It was a long race, but I was in the lead. I knew if I could keep my pace I would be able to win the race.
This is in first person, as can be seen by the multiple usage of " I ", which usually indicates first person. Third person point of view would be if it said she or the person's name did this and that etc.