I just finished running our parkour course. Even though I was not very graceful, and had to do most of the jumping off the other foot, which I am not used to doing, I was able to do most of it. My overall performance was probably about equal to the second or third time I did the course.
Sometimes it is easy to underestimate how much you have trained your body. My ankle is probably stronger and more flexible than it was five years ago, but it still feels weak to me because I am used to it being so much better.