Movement
I like to occasionally challenge myself by attempting something that seems impossible. Until the early 2000's I was pretty much a couch potato. In 2008ish I decided I was going to run a marathon.
I completed the 2008 Auckland Marathon in 5hr 59min. Walked a lot of the way and pretty much crawled over the finish line. I was a wreck for days, but I completed it!
In 2012 I ran the Auckland Marathon in 4hr 55min. Not a fast time, but I was still running at the finish line and pretty much ok the next day.

Achievement Unlocked.
I ran a few half-marathons since then but in 2020 the world went a bit crazy and I had some health scares and just kinda stopped running. I should start that up again one day.