I remember this one competition I did one time in junior high school. The junior high that I went has a swimming pool so we had a swimming unit at one point. One day, my p.e. teacher decided to hold a competition, to see who can hold their breath the longest. First it was competition for champion of each gender. A guy (whose name I can’t recall) won for the guys and I was the winner for the girls. Then the guy and I competed against each other. I wound up as the winner overall.
I found it to be a very interesting competition.