From a pretty young age, I was keen on swimming. I went (and still go) to a lake during the summer and, if you wanted to hang out with other kids, it was basically a prerequisite that you were able to swim because all the fun activities would take place when sailing or swimming or playing water polo. I was so intent on learning how to swim that I joined a swimming class and practiced for hours each week, eventually getting pretty good. At the age of eleven, myself and a big group of my friends decided to attempt a "mini Iron Man," which basically consisted of us swimming 3 km across a lake, climbing a mountain, climbing down, and swimming back. For the first half-kilometer of the swim, I, being the naive kid I was, was terrified to put my head in the lake because all I could see was the dark and I thought a shark was going to come up and eat me. Thankfully, the sun came up soon after and the lake didn't appear as dark, making me be more assured in my own safety. Our whole group was able to complete the task and even though we were pretty slow (10 hours to complete the whole thing), it was definitely an experience I won't ever forget. My friends and I ended up completing the same course for a few years after that and it was always a great way to see just how much we'd grown, both as swimmers and as friends over the course of the years. I haven't swam much since I quit swimming lessons a few years ago but I would definitely like to retry the course and maybe do some new stuff like swimming with sharks or dolphins (or even just some normal fish).