ION:
Today I had my first swim of the year, and in the sea no less. I was doing it to try out a wetsuit, though, so it's not like the temperature was any problem. On the contrary, I was equally surprised and delighted by how warm it felt, so I got kinda caught up in the swimming portion of it and didn't want to stop.
The only disadvantage (apart from a slight reduction of mobility) is that wetsuits are pretty buoyant, so it's hard to swim under water without weights, or even at all, really. Swimming on your back works pretty efficiently, though, so you're no entirely without means of propellation...
IRN:
Apart from swimming, I've also been jumping up and down cliffs and running over cobblestone (of the natural kind). It was this kind of nature in which I have a very hard time sitting still, I just have to go
everywhere, even if doing so should technically be impossible.