A long time ago in school gym class, we had to do these circuits for what I think was some sort of baseline physical evaluation type thing.
One of the things you had to do was start off laying down on your stomach, and at the whistle get up and sprint to a wall and then back.
I got up and started so fast the teacher didn't get a chance to start the timer. I had to do it again and of course wasn't as fast. I'll never be able to recapture that one moment.