Hang gliding is a close second. You are almost soaring through the air by yourself. But the big wing contraption is still there and you have to keep moving forward to stay aloft. When you're swimming, there's just you and the water. Up, down, those directions only limit you to the extent you can hold your breath.
There's some kind of irony in there about flying but having no air. Meh.
|I use it as a wallpaper.|